r1bq2nr/1pp1k2n/1b6/p2pPpNp/P1PP2PP/4P2R/QP6/RNB1KB2 w Q - 3 18
FEN state: r1bq2nr/1pp1k2n/1b6/p2pPpNp/P1PP2PP/4P2R/QP6/RNB1KB2 w Q - 3 18 ; Best move: a2a3
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black knight at g8 and black rook at h8. Black pawn at b7, black pawn at c7, black king at e7 and black knight at h7. Black bishop at b6. Black pawn at a5, black pawn at d5, white pawn at e5, black pawn at f5, white knight at g5 and black pawn at h5. White pawn at a4, white pawn at c4, white pawn at d4, white pawn at g4 and white pawn at h4. White pawn at e3 and white rook at h3. White queen at a2 and white pawn at b2. 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 3. Full move number is 18. White to move.