r1qk1b1r/pbppp1p1/2n4n/p4P1p/RQ6/5P2/1PPP2PP/1NB1KBNR w K - 6 10
FEN state: r1qk1b1r/pbppp1p1/2n4n/p4P1p/RQ6/5P2/1PPP2PP/1NB1KBNR w K - 6 10 ; Best move: b4b5
The current state of the chess board is: Black rook at a8, black queen at c8, black king at d8, black bishop at f8 and black rook at h8. Black pawn at a7, black bishop at b7, black pawn at c7, black pawn at d7, black pawn at e7 and black pawn at g7. Black knight at c6 and black knight at h6. Black pawn at a5, white pawn at f5 and black pawn at h5. White rook at a4 and white queen at b4. White pawn at f3. White pawn at b2, white pawn at c2, white pawn at d2, white pawn at g2 and white pawn at h2. White knight at b1, white bishop at c1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 6. Full move number is 10. White to move.