1rb1k1r1/p2pn3/3b1ppp/qPp3P1/PP1pnN1P/1Q3P1R/4P3/RNB1KB2 w Q - 2 21
FEN state: 1rb1k1r1/p2pn3/3b1ppp/qPp3P1/PP1pnN1P/1Q3P1R/4P3/RNB1KB2 w Q - 2 21 ; Best move: b4a5
The current state of the chess board is: Black rook at b8, black bishop at c8, black king at e8 and black rook at g8. Black pawn at a7, black pawn at d7 and black knight at e7. Black bishop at d6, black pawn at f6, black pawn at g6 and black pawn at h6. Black queen at a5, white pawn at b5, black pawn at c5 and white pawn at g5. White pawn at a4, white pawn at b4, black pawn at d4, black knight at e4, white knight at f4 and white pawn at h4. White queen at b3, white pawn at f3 and white rook at h3. White pawn at e2. White rook at a1, white knight at b1, white bishop at c1, white king at e1 and white bishop at f1. White queenside is the only castle move available. Half move number is 2. Full move number is 21. White to move.