r1b1kbn1/2n1p3/3p1p2/1p4q1/1BPP2pP/PP6/1R2PKP1/1Q3BNR b q - 0 21
FEN state: r1b1kbn1/2n1p3/3p1p2/1p4q1/1BPP2pP/PP6/1R2PKP1/1Q3BNR b q - 0 21 ; Best move: g5f4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8 and black knight at g8. Black knight at c7 and black pawn at e7. Black pawn at d6 and black pawn at f6. Black pawn at b5 and black queen at g5. White bishop at b4, white pawn at c4, white pawn at d4, black pawn at g4 and white pawn at h4. White pawn at a3 and white pawn at b3. White rook at b2, white pawn at e2, white king at f2 and white pawn at g2. White queen at b1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 21. Black to move.