It all started with a little crack.
In a heated endgame, where almost all the pieces were gone already, the computer wanted Predke to put more pressure on Sheva's rook while also activating his poor-positioned bishop to a more engaged square. However, instead of doing that, the Russian GM slid his inactive rook that was still at its home square, A8, to E8, wanting to involve it in the game as well.
The thought was decent. With Sheva's rook controlling the empty D file, he also wanted to do the same for the E file. The only problem was that it was in a perfect square for Sheva's rook to make two jumps in a row and fork it with the king as well. If that happened, that would be a disaster for the Russian GM. That was why the computer engine moved slightly upward, giving Sheva a +1.7 advantage for that mistake alone.
