World Championship 2013 - Critical Move #5

The final critical move is from game 9. Anand in a must-win situation, finally played aggressively and had a strong attack, but unfotunate to him, he blundered with 28. Nf1?? and resigned directly due to 28. ... Qe1. Instead, he should have played 28. Bf1, which wasn't directly winning, but would have kept the attack, the game, and the match going on for a bit longer.