1rbnkb1r/1p1pp3/p4p1p/q7/P1pn1p2/1PPPPN1N/1Q3KPP/R1B2BR1 b k - 1 21
FEN state: 1rbnkb1r/1p1pp3/p4p1p/q7/P1pn1p2/1PPPPN1N/1Q3KPP/R1B2BR1 b k - 1 21 ; Best move: d4b3
The current state of the chess board is: Black rook at b8, black bishop at c8, black knight at d8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at b7, black pawn at d7 and black pawn at e7. Black pawn at a6, black pawn at f6 and black pawn at h6. Black queen at a5. White pawn at a4, black pawn at c4, black knight at d4 and black pawn at f4. White pawn at b3, white pawn at c3, white pawn at d3, white pawn at e3, white knight at f3 and white knight at h3. White queen at b2, white king at f2, white pawn at g2 and white pawn at h2. White rook at a1, white bishop at c1, white bishop at f1 and white rook at g1. Black kingside is the only castle move available. Half move number is 1. Full move number is 21. Black to move.