r1b2k1r/2pp3p/n4qn1/pp3p1P/QPPPpP2/B6R/P2KP1P1/R4B2 b - - 2 20
FEN state: r1b2k1r/2pp3p/n4qn1/pp3p1P/QPPPpP2/B6R/P2KP1P1/R4B2 b - - 2 20 ; Best move: b5a4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at f8 and black rook at h8. Black pawn at c7, black pawn at d7 and black pawn at h7. Black knight at a6, black queen at f6 and black knight at g6. Black pawn at a5, black pawn at b5, black pawn at f5 and white pawn at h5. White queen at a4, white pawn at b4, white pawn at c4, white pawn at d4, black pawn at e4 and white pawn at f4. White bishop at a3 and white rook at h3. White pawn at a2, white king at d2, white pawn at e2 and white pawn at g2. White rook at a1 and white bishop at f1. Both players have exhausted their castles. Half move number is 2. Full move number is 20. Black to move.