r2q2nr/1b1npk2/2p4p/p4p2/pN1p1Pp1/2RP2PP/1BP1PK1R/4QBN1 b - - 0 21
FEN state: r2q2nr/1b1npk2/2p4p/p4p2/pN1p1Pp1/2RP2PP/1BP1PK1R/4QBN1 b - - 0 21 ; Best move: a5b4
The current state of the chess board is: Black rook at a8, black queen at d8, black knight at g8 and black rook at h8. Black bishop at b7, black knight at d7, black pawn at e7 and black king at f7. Black pawn at c6 and black pawn at h6. Black pawn at a5 and black pawn at f5. Black pawn at a4, white knight at b4, black pawn at d4, white pawn at f4 and black pawn at g4. White rook at c3, white pawn at d3, white pawn at g3 and white pawn at h3. White bishop at b2, white pawn at c2, white pawn at e2, white king at f2 and white rook at h2. White queen at e1, white bishop at f1 and white knight at g1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. Black to move.