1r1Bq1kr/p3p2p/nppp1bp1/3P1b2/P1P1P1nP/1P1Q4/R3KPP1/1N3BNR b - - 4 21
FEN state: 1r1Bq1kr/p3p2p/nppp1bp1/3P1b2/P1P1P1nP/1P1Q4/R3KPP1/1N3BNR b - - 4 21 ; Best move: a6c5
The current state of the chess board is: Black rook at b8, white bishop at d8, black queen at e8, black king at g8 and black rook at h8. Black pawn at a7, black pawn at e7 and black pawn at h7. Black knight at a6, black pawn at b6, black pawn at c6, black pawn at d6, black bishop at f6 and black pawn at g6. White pawn at d5 and black bishop at f5. White pawn at a4, white pawn at c4, white pawn at e4, black knight at g4 and white pawn at h4. White pawn at b3 and white queen at d3. White rook at a2, white king at e2, white pawn at f2 and white pawn at g2. White knight at b1, white bishop at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 21. Black to move.