r2qkbr1/p2npppp/bppp4/8/Pn2P3/2PP2PN/1P1KBP1P/RNBQ3R w q - 3 10
FEN state: r2qkbr1/p2npppp/bppp4/8/Pn2P3/2PP2PN/1P1KBP1P/RNBQ3R w q - 3 10 ; Best move: c3b4
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black knight at d7, black pawn at e7, black pawn at f7, black pawn at g7 and black pawn at h7. Black bishop at a6, black pawn at b6, black pawn at c6 and black pawn at d6. White pawn at a4, black knight at b4 and white pawn at e4. White pawn at c3, white pawn at d3, white pawn at g3 and white knight at h3. White pawn at b2, white king at d2, white bishop at e2, white pawn at f2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1, white queen at d1 and white rook at h1. Black queenside is the only castle move available. Half move number is 3. Full move number is 10. White to move.