2r1kb1r/1bp1np2/pp4q1/n2p4/P1P1Nppp/RP1P3N/4P2P/2QK1B1R b k - 5 21
FEN state: 2r1kb1r/1bp1np2/pp4q1/n2p4/P1P1Nppp/RP1P3N/4P2P/2QK1B1R b k - 5 21 ; Best move: g4h3
The current state of the chess board is: Black rook at c8, black king at e8, black bishop at f8 and black rook at h8. Black bishop at b7, black pawn at c7, black knight at e7 and black pawn at f7. Black pawn at a6, black pawn at b6 and black queen at g6. Black knight at a5 and black pawn at d5. White pawn at a4, white pawn at c4, white knight at e4, black pawn at f4, black pawn at g4 and black pawn at h4. White rook at a3, white pawn at b3, white pawn at d3 and white knight at h3. White pawn at e2 and white pawn at h2. White queen at c1, white king at d1, white bishop at f1 and white rook at h1. Black kingside is the only castle move available. Half move number is 5. Full move number is 21. Black to move.