r3k3/2pp4/bPnbpn2/p4p1p/1r6/P1N1Q1PP/1P1PPP2/R1BK1B1R w q - 5 20
FEN state: r3k3/2pp4/bPnbpn2/p4p1p/1r6/P1N1Q1PP/1P1PPP2/R1BK1B1R w q - 5 20 ; Best move: a3b4
The current state of the chess board is: Black rook at a8 and black king at e8. Black pawn at c7 and black pawn at d7. Black bishop at a6, white pawn at b6, black knight at c6, black bishop at d6, black pawn at e6 and black knight at f6. Black pawn at a5, black pawn at f5 and black pawn at h5. Black rook at b4. White pawn at a3, white knight at c3, white queen at e3, white pawn at g3 and white pawn at h3. White pawn at b2, white pawn at d2, white pawn at e2 and white pawn at f2. White rook at a1, white bishop at c1, white king at d1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 5. Full move number is 20. White to move.