Package 'chess2plyrs'

chess_move

Description

Takes in input a move, evaluates whether it is legal, and if it is, then the game is updated

Usage

chess_move(game, piece, initialposition = "", finalposition = "")

Arguments

game	chess game object (i.e., a list with elements board, turn, history, and fen_history as created by newgame function)
piece	letter indicating the piece to be moved (p, N, B, R, Q, K)
initialposition	initial square of the piece
finalposition	destination square

Value

makes move

Examples

newgame() |>
chess_move("N", "g1", "f3")

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chessplot

Description

plots the current position

Usage

chessplot(game, style = 1)

Arguments

game	chess game object (i.e., a list with elements board, turn, history, and fen_history as created by newgame function)
style	font style. 1: chess pieces according to unicode; 2: chess labels

Value

plot

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chesstools

Description

All tools used for letting the chess program work.

Usage

chesstools

Format

An object of class list

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engine2

Description

engine which chooses minimax between legal moves, with alpha beta pruning

Usage

engine2(game, depth)

Arguments

game	chess game object (i.e., a list with elements board, turn, history, and fen_history as created by newgame function)
depth	depth of the minimax. depth of 1 and 2 are fairly rapid.

Value

game with new move done

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game_result

Description

This function tells if the game is still ongoing, or if a checkamte or stalemate are on the board

Usage

game_result(game)

Arguments

game	chess game object (i.e., a list with elements board, turn, history, and fen_history as created by newgame function)

Value

a message

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legalmoves

Description

lists legal moves

Usage

legalmoves(game)

Arguments

game	chess game object (i.e., a list with elements board, turn, history, and fen_history as created by newgame function)

Value

character vector

Examples

newgame() |>
legalmoves()

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moves_scoresheet

Description

Creates move scorelist, in scientific notation

Usage

moves_scoresheet(game, shortnotation = TRUE)

Arguments

game	chess game object (i.e., a list with elements board, turn, history, and fen_history as created by newgame function)
shortnotation	Use short scientific notation? TRUE is the default

Value

moves scoresheet

Examples

g <- newgame() |>
  chess_move("p", "e2", "e4") |>
  chess_move("p", "e7", "e5") |>
  chess_move("N", "g1", "f3") |>
  chess_move("N", "b8", "c6") |>
  chess_move("B", "f1", "b5") |>
  chess_move("N", "g8", "f6") |>
  chess_move("K", "e1", "0-0")|>
  chess_move("N", "f6", "e4")
moves_scoresheet(g)

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newgame

Description

sets up a new chess game

Usage

newgame()

Value

new game

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random_mover

Description

engine which chooses randomly between legal moves

Usage

random_mover(game)

Arguments

game	chess game object (i.e., a list with elements board, turn, history, and fen_history as created by newgame function)

Value

game with new move done

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readfen

Description

read fen (Forsyth–Edwards Notation) notation

Usage

readfen(fenstring)

Arguments

fenstring

fen string (pieces and turn)

Value

board and turn

Examples

readfen("r3kb1r/pp1nqppp/4bp2/2p5/3P4/1B3N2/PPP1QPPP/R1B1K2R w")

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takeback

Description

takeback

Usage

takeback(game)

Arguments

game	chess game object (i.e., a list with elements board, turn, history, and fen_history as created by newgame function)

Value

game (last move being deleted)

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writefen

Description

write fen (Forsyth–Edwards Notation) notation

Usage

writefen(game, cb = NULL, tb = NULL, cb_tb_insteadof_game = FALSE)

Arguments

game	chess game object (i.e., a list with elements board, turn, history, and fen_history as created by newgame function)
cb	chess board if cb_tf_insteadof_game set to TRUE
tb	turn if cb_tf_insteadof_game set to TRUE
cb_tb_insteadof_game	if FALSE, uses game to create fen, if TRUE it uses cb and tb

Value

fen

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