threefold repetition / 50 move draw are not implemented

[paulsonkoly]

threefold repetition : http://en.wikipedia.org/wiki/Threefold_repetition
50 move draw : http://en.wikipedia.org/wiki/Fifty-move_rule

Both of these can be implemented using a history of the Zobrist hash. Question is where that history should live - ie part of the board or some other place that stores game history.

[paulsonkoly]

a FEN from chess.com that can be used to verify 3 fold repetition:

2r2rk1/4bppp/p3p3/3qN3/Nn1n2R1/7R/1P3PPP/2BQ2K1 w - - 0 1

atm we obviously don't see the solution as it's a draw by repetition