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64-413: Luca Bartolomeo de Pacioli, O.F.M. (sometimes Paccioli or Paciolo ; c. 1447 – 19 June 1517) was an Italian mathematician , Franciscan friar , collaborator with Leonardo da Vinci , and an early contributor to the field now known as accounting . He is referred to as the father of accounting and bookkeeping and he was the first person to publish a work on the double-entry system of book-keeping on

128-686: A basis for reunion, and they were actually accepted by a general chapter at Assisi in 1430; but the majority of the Conventual houses refused to agree to them, and they remained without effect. Equally unsuccessful were the attempts of the Franciscan Pope Sixtus IV , who bestowed a vast number of privileges on both original mendicant orders, but by this very fact lost the favor of the Observants and failed in his plans for reunion. Julius II succeeded in doing away with some of

192-875: A body of regulations known as the Rule of St Francis. These are: The Order of Friars Minor, known as the "Observants", most commonly simply called Franciscan friars , official name: "Friars Minor" (OFM). According to the 2013 Annuario Pontificio , the OFM has 2,212 communities; 14,123 members; 9,735 priests The Order of Friars Minor Capuchin or simply Capuchins , official name: "Friars Minor Capuchin" (OFM Cap). it has 1,633 communities; 10,786 members; 7,057 priests The Conventual Franciscans or Minorites , official name: "Friars Minor Conventual" (OFM Conv). It has 667 communities; 4,289 members; 2,921 priests A sermon on Mt 10:9 which Francis heard in 1209 made such an impression on him that he decided to fully devote himself to

256-408: A dark square. This may be remembered by the phrases "light on the right" and "queen on her own color". In formal competition, the piece colors for every matchup are allocated to players by the organizers. In informal games, colors are decided either by mutual agreement, or randomly, for example by a coin toss, or by one player concealing a white pawn in one hand and a black pawn in the other and having

320-513: A life of apostolic poverty. Clad in a rough garment, barefoot, and, after the Evangelical precept, without staff or scrip, he began to preach repentance. The mendicant orders had long been exempt from the jurisdiction of the bishop, and enjoyed (as distinguished from the secular clergy) unrestricted freedom to preach and hear confessions in the churches connected with their monasteries. This had led to endless friction and open quarrels between

384-834: A private teacher before becoming first chair in mathematics in 1477. During this time, he wrote a comprehensive textbook in the vernacular for his students. He continued to work as a private tutor of mathematics and was instructed to stop teaching at this level in Sansepolcro in 1491. In 1494, his first book, Summa de arithmetica, geometria, Proportioni et proportionalita , was published in Venice. In 1497, he accepted an invitation from Duke Ludovico Sforza to work in Milan . There he met, taught mathematics to, collaborated, and lived with Leonardo da Vinci . In 1499, Pacioli and Leonardo were forced to flee Milan when Louis XII of France seized

448-680: A role it assumed in 1948. The current World Champion is Ding Liren of China. The reigning Women's World Champion is Ju Wenjun from China. Other competitions for individuals include the World Junior Chess Championship , the European Individual Chess Championship , the tournaments for the World Championship qualification cycle , and the various national championships . Invitation-only tournaments regularly attract

512-511: A series of games between two players, or a team competition in which each player of one team plays one game against a player of the other team. Chess's international governing body is usually known by its French acronym FIDE (pronounced FEE-day) ( French : Fédération internationale des échecs), or International Chess Federation. FIDE's membership consists of the national chess organizations of over 180 countries; there are also several associate members, including various supra-national organizations,

576-510: A simple trap known as the Scholar's mate (see animated diagram) can be recorded: Variants of algebraic notation include long algebraic , in which both the departure and destination square are indicated; abbreviated algebraic , in which capture signs, check signs, and ranks of pawn captures may be omitted; and Figurine Algebraic Notation, used in chess publications for universal readability regardless of language. Portable Game Notation (PGN)

640-476: A wide variety of styles. The Staunton pattern is the most common, and is usually required for competition. Chess pieces are divided into two sets, usually light and dark colored, referred to as white and black , regardless of the actual color or design. The players of the sets are referred to as White and Black , respectively. Each set consists of sixteen pieces: one king , one queen , two rooks , two bishops , two knights , and eight pawns . The game

704-479: Is a mendicant religious order of men that traces its origin to Francis of Assisi. Their official Latin name is the Ordo Fratrum Minorum Which is the name Francis gave his brotherhood. Having been born among the minorum (serfs, second class citizens), before his conversion, he aspired to move up the social ladder to the maiorum (nobles, first class citizens). After a life of conversion,

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768-399: Is a text-based file format for recording chess games, based on short form English algebraic notation with a small amount of markup . PGN files (suffix .pgn) can be processed by most chess software, as well as being easily readable by humans. Until about 1980, the majority of English language chess publications used descriptive notation , in which files are identified by the initial letter of

832-424: Is an abstract strategy game that involves no hidden information and no elements of chance . It is played on a chessboard with 64 squares arranged in an 8×8 grid. The players, referred to generically as "White" and "Black" , each control sixteen pieces : one king , one queen , two rooks , two bishops , two knights , and eight pawns . White moves first, followed by Black; then moves alternate. The object of

896-415: Is compulsory; a player may not skip a turn, even when having to move is detrimental . Each piece has its own way of moving. In the diagrams, crosses mark the squares to which the piece can move if there are no intervening piece(s) of either color (except the knight, which leaps over any intervening pieces). All pieces except the pawn can capture an enemy piece if it is on a square to which they could move if

960-423: Is controlled using a chess clock that has two displays, one for each player's remaining time. Analog chess clocks have been largely replaced by digital clocks, which allow for time controls with increments . Time controls are also enforced in correspondence chess competitions. A typical time control is 50 days for every 10 moves. Historically, many different notation systems have been used to record chess moves;

1024-399: Is not a permissible response to a check. The object of the game is to checkmate the opponent; this occurs when the opponent's king is in check, and there is no legal way to get it out of check. It is never legal for a player to make a move that puts or leaves the player's own king in check. In casual games, it is common to announce "check" when putting the opponent's king in check, but this

1088-411: Is not required by the rules of chess and is usually not done in tournaments. Once per game, each king can make a move known as castling . Castling consists of moving the king two squares toward a rook of the same color on the same rank, and then placing the rook on the square that the king crossed. Castling is permissible if the following conditions are met: Castling is still permitted if

1152-422: Is played on a square board of eight rows (called ranks ) and eight columns (called files ). Although it does not affect game play, by convention the 64 squares alternate in color and are referred to as light and dark squares. Common colors for wooden chessboards are light and dark brown, while vinyl chessboards are commonly buff and green. To start the game, White's pieces are placed on

1216-491: Is recognized in FIDE-sanctioned events; game scores recorded in a different notation system may not be used as evidence in the event of a dispute. Chess is often played casually in public spaces such as parks and town squares. Contemporary chess is an organized sport with structured international and national leagues, tournaments, and congresses . Thousands of chess tournaments, matches, and festivals are held around

1280-436: Is the current World Champion. A huge body of chess theory has developed since the game's inception. Aspects of art are found in chess composition , and chess in its turn influenced Western culture and the arts , and has connections with other fields such as mathematics , computer science , and psychology . One of the goals of early computer scientists was to create a chess-playing machine . In 1997, Deep Blue became

1344-526: Is usually calculated as 1 point for each game won and one-half point for each game drawn. Variations such as "football scoring" (3 points for a win, 1 point for a draw) may be used by tournament organizers, but ratings are always calculated on the basis of standard scoring. A player's score may be reported as total score out of games played (e.g. 5½/8), points for versus points against (e.g. 5½–2½), or by number of wins, losses and draws (e.g. +4−1=3). The term "match" refers not to an individual game, but to either

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1408-885: The International Braille Chess Association (IBCA), International Committee of Chess for the Deaf (ICCD), and the International Physically Disabled Chess Association (IPCA). FIDE is recognized as a sports governing body by the International Olympic Committee , but chess has never been part of the Olympic Games . FIDE's most visible activity is organizing the World Chess Championship ,

1472-723: The Observant branch (postnominal abbreviation OFM Obs.), is one of the three Franciscan First Orders within the Catholic Church , the others being the Capuchins (postnominal abbreviation OFM Cap.) and Conventuals (postnominal abbreviation OFM Conv). The Order of Friars Minor, in its current form, is the result of an amalgamation of several smaller Franciscan orders (e.g. Alcantarines , Recollects , Reformanti , etc.), completed in 1897 by Pope Leo XIII . The Capuchin and Conventual remain distinct religious institutes within

1536-633: The Seventh Crusade , when Louis IX asked who the particularly zealous monks pursuing Saracens were, and was told they were "de cordes liés" . Upon the crusaders return to France, the name became part of the language. Arranged according to date of celebration which is marked in brackets. Books Articles Chess Chess is a board game for two players. It is sometimes called international chess or Western chess to distinguish it from related games such as xiangqi (Chinese chess) and shogi (Japanese chess). Chess

1600-409: The chess problems that appear in the manuscript or at least designed the chess pieces used in the problems. Footnotes Citations Order of Friars Minor Francis began preaching around 1207 and traveled to Rome to seek approval of his order from Pope Innocent III in 1209. The original Rule of Saint Francis approved by the pope disallowed ownership of property, requiring members of

1664-532: The Catholic Church, observing the Rule of Saint Francis with different emphases. Franciscans are sometimes referred to as minorites or greyfriars because of their habit . In Poland and Lithuania they are known as Bernardines , after Bernardino of Siena , although the term elsewhere refers rather to Cistercians . The "Order of Friars Minor" are commonly called simply the " Franciscans ". This Order

1728-597: The Game of Chess ). Long thought to have been lost, a surviving manuscript was rediscovered in 2006, in the 22,000-volume library of Count Guglielmo Coronini-Cronberg in Gorizia . A facsimile edition of the book was published in Pacioli's home town of Sansepolcro in 2008. Based on Leonardo da Vinci's long association with the author and his having illustrated Divina proportione , some scholars speculate that Leonardo either drew

1792-609: The authority of the Minister General of the Order, a member of the Observant branch, but were allowed their distinct practices. They included: A difference of opinion developed in the community concerning the interpretation of the rule regarding property. The Observants held to a strict interpretation that the friars may not hold any property either individually nor communally. The literal and unconditional observance of this

1856-407: The city and drove out their patron. Their paths appear to have finally separated around 1506. Pacioli died at about the age of 70 on 19 June 1517, most likely in Sansepolcro, where it is thought that he had spent much of his final years. Pacioli published several works on mathematics , including: The majority of the second volume of Summa de arithmetica, geometria. Proportioni et proportionalita

1920-470: The continent. He was also called Luca di Borgo after his birthplace, Borgo Sansepolcro , Tuscany . Luca Pacioli was born between 1446 and 1448 in the Tuscan town of Sansepolcro where he received an abbaco education . This was education in the vernacular ( i.e. , the local tongue) rather than Latin and focused on the knowledge required of merchants. His father was Bartolomeo Pacioli; however, Luca Pacioli

1984-551: The development of accounting." The ICAEW Library's rare book collection at Chartered Accountants' Hall holds the complete published works of Luca Pacioli. Sections of two of Pacioli's books, 'Summa de arithmetica' and 'Divina proportione' can be viewed online using Turning the Pages, an interactive tool developed by the British Library. Luca Pacioli also wrote an unpublished treatise on chess , De ludo scachorum ( On

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2048-584: The end of the 15th century, with standardization and universal acceptance by the end of the 19th century. Today, chess is one of the world's most popular games, with millions of players worldwide. Organized chess arose in the 19th century. Chess competition today is governed internationally by FIDE ( Fédération Internationale des Échecs ; the International Chess Federation). The first universally recognized World Chess Champion , Wilhelm Steinitz , claimed his title in 1886; Ding Liren

2112-404: The end of the game, " 1–0 " means White won, " 0–1 " means Black won, and " ½–½ " indicates a draw. Chess moves can be annotated with punctuation marks and other symbols . For example: " ! " indicates a good move; " !! " an excellent move; " ? " a mistake; " ?? " a blunder; " !? " an interesting move that may not be best; or " ?! " a dubious move not easily refuted. For example, one variation of

2176-448: The enemy pawn's two-square advance; otherwise, the right to do so is forfeited. For example, in the animated diagram, the black pawn advances two squares from g7 to g5, and the white pawn on f5 can take it en passant on g6 (but only immediately after the black pawn's advance). When a pawn advances to its eighth rank , as part of the move, it is promoted and must be exchanged for the player's choice of queen, rook, bishop, or knight of

2240-664: The first computer to beat a reigning World Champion in a match when it defeated Garry Kasparov . Today's chess engines are significantly stronger than the best human players and have deeply influenced the development of chess theory; however, chess is not a solved game . The rules of chess are published by FIDE (Fédération Internationale des Échecs; "International Chess Federation"), chess's world governing body, in its Handbook . Rules published by national governing bodies , or by unaffiliated chess organizations, commercial publishers, etc., may differ in some details. FIDE's rules were most recently revised in 2023. Chess sets come in

2304-423: The first rank in the following order, from left to right: rook, knight, bishop, queen, king, bishop, knight, rook. Pawns are placed on each square of the second rank. Black's position mirrors White's, with equivalent pieces on every file. The board is oriented so that the right-hand corner nearest each player is a light square; as a result the white queen always starts on a light square, while the black queen starts on

2368-407: The first rank moves to e2"). For pawns, no letter initial is used; so e4 means "pawn moves to the square e4". If the piece makes a capture, "x" is usually inserted before the destination square. Thus Bxf3 means "bishop captures on f3". When a pawn makes a capture, the file from which the pawn departed is used to identify the pawn making the capture, for example, exd5 (pawn on the e-file captures

2432-436: The g-file, 5th rank" (that is, to the square g5). Different initials may be used for other languages. In chess literature, figurine algebraic notation (FAN) is frequently used to aid understanding independent of language. To resolve ambiguities, an additional letter or number is added to indicate the file or rank from which the piece moved (e.g. Ngf3 means "knight from the g-file moves to the square f3"; R1e2 means "rook on

2496-567: The game is to checkmate (threaten with inescapable capture) the enemy king. There are also several ways a game can end in a draw . The recorded history of chess goes back at least to the emergence of a similar game, chaturanga , in seventh-century India . After its introduction in Persia , it spread to the Arab world and then to Europe. The rules of chess as they are known today emerged in Europe at

2560-571: The groups that followed the Franciscan Rule literally were united to the Observants, and the right to elect the Minister General of the Order , together with the seal of the order, was given to the group united under the Observants. This grouping, since it adhered more closely to the rule of the founder, was allowed to claim a certain superiority over the Conventuals. The Observant general (elected now for six years, not for life) inherited

2624-487: The name of his brotherhood (Order of Second-Class Brothers) indicates his coming to an appreciation of his social condition on behalf of those who have no class or citizenship in society. The modern organization of the Friars Minor comprises several separate families or groups, each considered a religious order in its own right under its own Minister General and particular type of governance. They all live according to

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2688-414: The opponent choose. White moves first, after which players alternate turns, moving one piece per turn (except for castling , when two pieces are moved). A piece is moved to either an unoccupied square or one occupied by an opponent's piece, which is captured and removed from play. With the sole exception of en passant , all pieces capture by moving to the square that the opponent's piece occupies. Moving

2752-442: The opponent has enough pieces left to deliver checkmate). The duration of a game ranges from long (or "classical") games, which can take up to seven hours (even longer if adjournments are permitted), to bullet chess (under 3 minutes per player for the entire game). Intermediate between these are rapid chess games, lasting between one and two hours per game, a popular time control in amateur weekend tournaments. Time

2816-487: The order to beg for food while preaching. The austerity was meant to emulate the life and ministry of Jesus Christ . Franciscans traveled and preached in the streets, while boarding in church properties. The extreme poverty required of members was relaxed in the final revision of the Rule in 1223. The degree of observance required of members remained a major source of conflict within the order, resulting in numerous secessions. The Order of Friars Minor, previously known as

2880-427: The piece chosen is indicated after the move (for example, e1=Q or e1Q ). Castling is indicated by the special notations 0-0 (or O-O ) for kingside castling and 0-0-0 (or O-O-O ) for queenside castling. A move that places the opponent's king in check usually has the notation " + " added. There are no specific notations for discovered check or double check . Checkmate can be indicated by " # ". At

2944-443: The piece on d5). Ranks may be omitted if unambiguous, for example, exd (pawn on the e-file captures a piece somewhere on the d-file). A minority of publications use " : " to indicate a capture, and some omit the capture symbol altogether. In its most abbreviated form, exd5 may be rendered simply as ed . An en passant capture may optionally be marked with the notation " e.p. " If a pawn moves to its last rank, achieving promotion,

3008-555: The piece that occupies the first rank at the beginning of the game. In descriptive notation, the common opening move 1.e4 is rendered as "1.P-K4" ("pawn to king four"). Another system is ICCF numeric notation , recognized by the International Correspondence Chess Federation though its use is in decline. In tournament games, players are normally required to keep a score (record of the game). For this purpose, only algebraic notation

3072-452: The reformed congregations and annexed them to the Observants; it then declared the Observants an independent order, and separated them completely from the Conventuals. The less strict principles of the Conventuals, permitting the possession of real estate and the enjoyment of fixed revenues, were recognized as tolerable, while the Observants, in contrast to this usus moderatus , were held strictly to their own usus arctus or pauper . All of

3136-429: The required piece is not available (e.g. a second queen) an inverted rook is sometimes used as a substitute, but this is not recognized in FIDE-sanctioned games. A game can be won in the following ways: There are several ways a game can end in a draw : In competition, chess games are played with a time control . If a player's time runs out before the game is completed, the game is automatically lost (provided

3200-402: The rook is under attack, or if the rook crosses an attacked square. When a pawn makes a two-step advance from its starting position and there is an opponent's pawn on a square next to the destination square on an adjacent file, then the opponent's pawn can capture it en passant ("in passing"), moving to the square the pawn passed over. This can be done only on the turn immediately following

3264-407: The same color. Usually, the pawn is chosen to be promoted to a queen, but in some cases, another piece is chosen; this is called underpromotion . In the animated diagram , the pawn on c7 can be advanced to the eighth rank and be promoted. There is no restriction on the piece promoted to, so it is possible to have more pieces of the same type than at the start of the game (e.g., two or more queens). If

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3328-552: The smaller branches, but left the division of the two great parties untouched. This division was finally legalized by Leo X , after a general chapter held in Rome in 1517, in connection with the reform movement of the Fifth Lateran Council , had once more declared the impossibility of reunion. Leo X summoned on 11 July 1516 a general chapter to meet at Rome on the feast of Pentecost 31 May 1517. This chapter suppressed all

3392-415: The square were unoccupied. Pieces are generally not permitted to move through squares occupied by pieces of either color, except for the knight and during castling. When a king is under immediate attack, it is said to be in check . A move in response to a check is legal only if it results in a position where the king is no longer in check. There are three ways to counter a check: Castling

3456-452: The standard system today is short-form algebraic notation . In this system, each square is uniquely identified by a set of coordinates, a – h for the files followed by 1 – 8 for the ranks. The usual format is The pieces are identified by their initials. In English, these are K (king), Q (queen), R (rook), B (bishop), and N (knight; N is used to avoid confusion with king). For example, Qg5 means "queen moves to

3520-534: The strict observance of the rule. Pope Martin V , in the Brief Ad statum of 23 August 1430, allowed the Conventuals to hold property like all other orders. Projects for a union between the two main branches of the order were put forth not only by the Council of Constance but by several popes, without any positive result. By direction of Pope Martin V , John of Capistrano drew up statutes which were to serve as

3584-815: The title of "Minister-General of the Whole Order of St. Francis" and was granted the right to confirm the choice of a head for the Conventuals, who was known as "Master-General of the Friars Minor Conventual"—although this privilege never became practically operative. In 1875, the Kulturkampf expelled the majority of the German Franciscans, most of whom settled in North America. The habit has been gradually changed in colour and certain other details. Its colour, which

3648-496: The translated volume Divina proportione , and that it may just have been appended to his work. However, no such defense can be presented concerning the inclusion of Piero della Francesca's material in Pacioli's Summa. Pacioli dramatically affected the practice of accounting by describing the double-entry accounting method used in parts of Italy. This revolutionized how businesses oversaw their operations, enabling improved efficiency and profitability. The Summa' s section on accounting

3712-513: The two divisions of the clergy. This question was definitively settled by the Council of Trent . Amid numerous dissensions in the 14th century, a number of separate observances sprang up, almost like sects (to say nothing of the heretical parties of the Beghards and Fraticelli ), some of which developed within the order on both hermit and cenobitic principles. They all operated generally under

3776-463: The world every year catering to players of all levels. Tournaments with a small number of players may use the round-robin format, in which every player plays one game against every other player. For a large number of players, the Swiss system may be used, in which each player is paired against an opponent who has the same (or as similar as possible) score in each round. In either case, a player's score

3840-502: Was a slightly rewritten version of one of Piero della Francesca 's works. The third volume of Pacioli's Divina proportione was an Italian translation of Piero della Francesca 's Latin book De quinque corporibus regularibus . In neither case did Pacioli include an attribution to Piero. He was severely criticized for this and accused of plagiarism by sixteenth-century art historian and biographer Giorgio Vasari . R. Emmett Taylor (1889–1956) said that Pacioli may have had nothing to do with

3904-592: Was at first grey or a medium brown, is now a dark brown. The dress, which consists of a loose-sleeved gown, is confined by a white cord, from which is hung, since the fifteenth century, the Seraphic Rosary with its seven decades. Sandals are substituted for shoes. Around the neck and over the shoulders hangs the cowl. The habit of referring to the Francisans as Cordeliers in France is said to date back to

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3968-528: Was rendered impracticable by the great expansion of the order, its pursuit of learning, and the accumulated property of the large cloisters in the towns. Regulations were drafted by which all alms donated were held by custodians appointed by the Holy See, who would make distributions upon request. It was John XXII who had introduced Conventualism in the sense of community of goods, income, and property as in other religious orders, in contradiction to Observantism or

4032-591: Was said to have lived with the Befolci family as a child in his birth town Sansepolcro. He moved to Venice around 1464, where he continued his own education while working as a tutor to the three sons of a merchant. It was during this period that he wrote his first book, a treatise on arithmetic for the boys he was tutoring. Between 1472 and 1475, he became a Franciscan friar. Thus, he could be referred to as Fra ('Friar') Luca. In 1475, he started teaching in Perugia as

4096-436: Was used internationally as an accounting textbook up to the mid-16th century. The essentials of double-entry accounting have for the most part remained unchanged for over 500 years. "Accounting practitioners in public accounting, industry, and not-for-profit organizations, as well as investors, lending institutions, business firms, and all other users for financial information are indebted to Luca Pacioli for his monumental role in

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