1r2kb1r/1ppn3p/4bppn/P3p3/Rp1P3P/2PB1P2/2KP2P1/1NBQ2NR b - - 6 21
FEN state: 1r2kb1r/1ppn3p/4bppn/P3p3/Rp1P3P/2PB1P2/2KP2P1/1NBQ2NR b - - 6 21 ; Best move: b4b3
The current state of the chess board is: Black rook at b8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at b7, black pawn at c7, black knight at d7 and black pawn at h7. Black bishop at e6, black pawn at f6, black pawn at g6 and black knight at h6. White pawn at a5 and black pawn at e5. White rook at a4, black pawn at b4, white pawn at d4 and white pawn at h4. White pawn at c3, white bishop at d3 and white pawn at f3. White king at c2, white pawn at d2 and white pawn at g2. White knight at b1, white bishop at c1, white queen at d1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 6. Full move number is 21. Black to move.