1r1q1b1r/2pkpp2/p6p/n3pbp1/1pN1PPP1/n1PP3Q/PB4KP/2R2B1R b - - 0 21
FEN state: 1r1q1b1r/2pkpp2/p6p/n3pbp1/1pN1PPP1/n1PP3Q/PB4KP/2R2B1R b - - 0 21 ; Best move: a5c4
The current state of the chess board is: Black rook at b8, black queen at d8, black bishop at f8 and black rook at h8. Black pawn at c7, black king at d7, black pawn at e7 and black pawn at f7. Black pawn at a6 and black pawn at h6. Black knight at a5, black pawn at e5, black bishop at f5 and black pawn at g5. Black pawn at b4, white knight at c4, white pawn at e4, white pawn at f4 and white pawn at g4. Black knight at a3, white pawn at c3, white pawn at d3 and white queen at h3. White pawn at a2, white bishop at b2, white king at g2 and white pawn at h2. White rook at c1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. Black to move.