|White to move after 13. ....d4?|
This is the wrong plan for Black. Moving either one of the rooks to e8 to challenge for the center was better. White also gets a free move as Black must waste one to protect this advanced d-pawn. (-.3)
|After Black's error of 28. ......Qd5?|
Instead, the game is even again and White can secure a draw with a perpetual check using the knight and a discovered check by the queen (followed by Nf7+, then Nh6 double +, and then Nf7+, etc. But Black blunders the draw away thinking his queen is protecting the rook!