E bazat pe sjeng:
Câteva citare din readme-ul din codul sursă al lui Chess.app (porniți chess, Chess->About Chess->Download Source Code… și e link-ul în partea de jos a paginii
Sjeng is a chessprogram that plays many variants.
In addition to that, it can also play normal chess
quite well and is fully compatible with the standard
XBoard/WinBoard protocol (version 1 and 2). Sjeng
also supports some broken WinBoard implementations,
such as the one present in the ChessBase/Fritz WinBoard
adapter.
Technically, Sjeng is a highly advanced alpha-beta searcher,
using modern techniques like history and killer moves,
transposition tables, SEE move ordering and pruning, and
search enhancements like selective extensions, Aspiration
Principal Variation Search, Adaptive nullmove pruning,
Extended Futility Pruning and Limited Razoring. Sjeng can
use an opening book and learns from the games it plays.
In it’s suicide and losers mode, Sjeng use proof-number
searches to quickly find forced wins. Sjeng plays at the
same level that the best humans are capable of.
On 14th of October 2000, Sjeng won it’s first title
by becoming the World Computer Crazyhouse Chess Champion.
On December 31th 2000, Sjeng became the first computer
program to reach the #1 spot on the crazyhouse rating list
on the Free Internet Chess Server. It had been #1 on the
Internet Chess Club before.
Early 2001 Sjeng became the #1 losers/giveaway player
on the Internet Chess Club.
What is bughouse ?
—————————
Bughouse is a form of chess which is played with 2 teams,
each consisting of 2 players. Each player plays his opponent
on a seperate board. If a piece is captured, the capturing
player can pass it on to his partner, who can then drop the
piece into his game and use it.
If you have never played bughouse before, you are really
missing out on something. Try it, you’ll like it.
for a more complete description of the rules:
http://matador.unige.ch/nabla/Bug/rules.html
What is crazyhouse ?
——————————
Crazyhouse is similar to bughouse, but is played
with only 2 players, on 1 board.
What is suicide/giveaway/anti-chess ?
——————————————————-
Suicide is a form of chess where the goal is to
lose all your pieces. Your king acts like a normal
piece and can be captured, and you can promote
pawns to a king. If you can capture, you must.
Suicide is sometimes referred to as giveaway or anti-chess,
although there are minor differences between variants.
In suicide, castling is not allowed, but in giveaway
it is. If a player is stalemated, he loses in giveaway,
but in suicide he wins if he has less material than his
opponent.
What is losers ?
————————
Losers is similar to suicide with the exception
that the king may not be captured, you cannot
promote pawns to kings, and if you are checkmated
you win.
