r1b1kr2/p5bp/1pppqp1n/P1n1p3/2P1P1pP/5N2/1P1P1PPR/R1BK1BN1 w q - 0 20
FEN state: r1b1kr2/p5bp/1pppqp1n/P1n1p3/2P1P1pP/5N2/1P1P1PPR/R1BK1BN1 w q - 0 20 ; Best move: a5b6
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black rook at f8. Black pawn at a7, black bishop at g7 and black pawn at h7. Black pawn at b6, black pawn at c6, black pawn at d6, black queen at e6, black pawn at f6 and black knight at h6. White pawn at a5, black knight at c5 and black pawn at e5. White pawn at c4, white pawn at e4, black pawn at g4 and white pawn at h4. White knight at f3. White pawn at b2, white pawn at d2, white pawn at f2, white pawn at g2 and white rook at h2. White rook at a1, white bishop at c1, white king at d1, white bishop at f1 and white knight at g1. Black queenside is the only castle move available. Half move number is 0. Full move number is 20. White to move.