rn2k2r/2p1pp1p/7n/1p4p1/PQ2PB2/6P1/1qP2P1P/R3KB1R b KQ - 1 21
FEN state: rn2k2r/2p1pp1p/7n/1p4p1/PQ2PB2/6P1/1qP2P1P/R3KB1R b KQ - 1 21 ; Best move: b2b4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8 and black rook at h8. Black pawn at c7, black pawn at e7, black pawn at f7 and black pawn at h7. Black knight at h6. Black pawn at b5 and black pawn at g5. White pawn at a4, white queen at b4, white pawn at e4 and white bishop at f4. White pawn at g3. Black queen at b2, white pawn at c2, white pawn at f2 and white pawn at h2. White rook at a1, white king at e1, white bishop at f1 and white rook at h1. White kingside and white queenside castles are available. Half move number is 1. Full move number is 21. Black to move.