CHECKERS VS SHATAR

Draughts (/drɑːfts, dræfts/; British English) or checkers (American English) is a group of strategy board games for two players which involve diagonal moves of uniform game pieces and mandatory captures by jumping over opponent pieces. Draughts developed from alquerque. The name 'draughts' derives from the verb to draw or to move, wheras 'checkers' derives from the checkered board which the game is played on. The most popular forms are English draughts, also called American checkers, played on an 8×8 checkerboard; Russian draughts, also played on an 8×8, and international draughts, played on a 10×10 board. There are many other variants played on 8×8 boards. Canadian checkers and Singaporean/Malaysian checkers (also locally known as dum) are played on a 12×12 board. English draughts was weakly solved in 2007 by a team of Canadian computer scientists led by Jonathan Schaeffer. From the standard starting position, both players can guarantee a draw with perfect play. Draughts is played by two opponents, on opposite sides of the gameboard. One player has the dark pieces; the other has the light pieces. Players alternate turns. A player may not move an opponent's piece. A move consists of moving a piece diagonally to an adjacent unoccupied square. If the adjacent square contains an opponent's piece, and the square immediately beyond it is vacant, the piece may be captured (and removed from the game) by jumping over it. Only the dark squares of the checkered board are used. A piece may move only diagonally into an unoccupied square. When presented, capturing is mandatory in most official rules, although some rule variations make capturing optional. In almost all variants, the player without pieces remaining, or who cannot move due to being blocked, loses the game.

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Shatar (Mongolian: ᠮᠣᠩᠭᠣᠯ ᠰᠢᠲᠠᠷ᠎ᠠ Monggol sitar-a, "Mongolian shatranj"; a.k.a. shatar) and hiashatar are two chess variants played in Mongolia. The rules are similar to standard chess; the differences being that: The noyan (ᠨᠣᠶᠠᠨ, lord) does not castle. The küü (ᠬᠦᠦ, pawn) does not have an initial double-step move option, except for the queen pawn or king pawn. In old shatar rules, a pawn that reaches its eighth rank must promote to half-power tiger. But a pawn could step back to its sixth rank to promote to all-power tiger. It moves like a queen. The baras (ᠪᠠᠷᠰ or ᠪᠠᠷᠠᠰ, tiger; Persian: fers) moves like a promoted rook in shogi: like a chess rook or one square diagonally. It was called half-power tiger or half-power lion in old shatar rules. In modern shatar rules, a baras moves like a queen. The mori (knight; ᠮᠣᠷᠢ) cannot deliver mate. In modern shatar rules, the mori can give mate. The bishop (teme) and rook (terge) move as they do in standard chess. The game always starts by White playing 1.d4 and Black responding with 1...d5. This is the only time in the game a pawn may advance two squares; some sources claim this initial move can optionally be made with the e-pawn. In old shatar rules, Ujimqin player must make an initial double-step move with the queen pawn; in Chahar, the king pawn. In old shatar rules, baremate is draw. In old shatar rules, one special rule is called tuuxəi, like komi in Go. A player could leave the enemy with only two pieces remaining (noyan and another piece) at the end. Then he must start making checks using the terge or baras and make consecutive checks until checkmate. Before checkmate, number of consecutive checks is the number of tuuxəi. If a player wins by checkmate as in chess, he receives only one tuuxəi. A player usually leaves the enemy with one noyan and one küü to allow time to put his pieces into good positions for making consecutive checks.

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