Thanks for the analysis! Apparently it wasn't time pressure for Vincent Keymer: he spent 11 1/2 minutes on 33.-Nb1? - anyway, would one go for such a committal decision, good or bad or "in between", when low on time? 34.-b3? was played in just 22 seconds, but must have been the same thinking unit. He could again spend 8 1/2 minutes on 36.-Nc3 realizing what he had done.
A German source considered it a winning attempt - thinking/hallucinating that the black b-pawn would promote or cost white a piece? Maybe from afar he missed something relatively simple (at least once it appears or is about to appear on the board): both bishops are hanging after 37.-Nxa4 38.Nxb3.
Giri's mistake, also on move 34 and after 47 seconds, may well have been due to some time pressure. Earlier, Erigaisi had spent 21 minutes for 13.- 0-0-0?. So it may rather be a case of being unprepared for the rare and old 13.Qe2 (high-level games from the previous millennium) or not remembering his notes but not mis-remembering something.
All this assumes that times per move given on chess24 are reasonably accurate - watching live things are often confusing, maybe due to the 15 minute delay in live transmission introduced this year.
Thanks for the analysis! Apparently it wasn't time pressure for Vincent Keymer: he spent 11 1/2 minutes on 33.-Nb1? - anyway, would one go for such a committal decision, good or bad or "in between", when low on time? 34.-b3? was played in just 22 seconds, but must have been the same thinking unit. He could again spend 8 1/2 minutes on 36.-Nc3 realizing what he had done.
A German source considered it a winning attempt - thinking/hallucinating that the black b-pawn would promote or cost white a piece? Maybe from afar he missed something relatively simple (at least once it appears or is about to appear on the board): both bishops are hanging after 37.-Nxa4 38.Nxb3.
Giri's mistake, also on move 34 and after 47 seconds, may well have been due to some time pressure. Earlier, Erigaisi had spent 21 minutes for 13.- 0-0-0?. So it may rather be a case of being unprepared for the rare and old 13.Qe2 (high-level games from the previous millennium) or not remembering his notes but not mis-remembering something.
All this assumes that times per move given on chess24 are reasonably accurate - watching live things are often confusing, maybe due to the 15 minute delay in live transmission introduced this year.