r1b2bnr/1pppkp1p/n3p1p1/1q6/1p6/NR1P1PB1/P1P1P1PP/3QKBNR w K - 0 10
FEN state: r1b2bnr/1pppkp1p/n3p1p1/1q6/1p6/NR1P1PB1/P1P1P1PP/3QKBNR w K - 0 10 ; Best move: a3b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at b7, black pawn at c7, black pawn at d7, black king at e7, black pawn at f7 and black pawn at h7. Black knight at a6, black pawn at e6 and black pawn at g6. Black queen at b5. Black pawn at b4. White knight at a3, white rook at b3, white pawn at d3, white pawn at f3 and white bishop at g3. White pawn at a2, white pawn at c2, white pawn at e2, white pawn at g2 and white pawn at h2. White queen at d1, 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 0. Full move number is 10. White to move.