Stop Pgn Reader at 3fold

[gahtan-syarif]

[Result "1/2-1/2"]

1. e4 Nc6 2. Nf3 d5 3. exd5 Qxd5 4. Nc3 Qd8 5. Nb1 Qd5 6. Ng1 Qd8 7. Nf3 Qd5 8. Nc3 Qa5 1/2-1/2

when specified plies=16 , cutechess would only parse it to 7. Nf3 while fastchess parses the full 8 moves. the reason cutechess stops prematurely is because 7. Qd5 is a 3fold repetition draw. should we do the same thing for fast-chess?

[vondele]

note that in general (e.g. for analysis) you'd like to be able to go past a 3-fold, it is just for the book lines this might make some sense.

[Disservin]

given that we stop at an illegal move #642, this makes sense to also respect if the game is over and stop just right before