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The Kenyans basically blocked the field for 600m. With such a slow pace, the man in front will have a better than 90% chance of winning because EVERYONE will be fast over the last 200. Good team tactics by the Kenyans, but age and other things will catch up with Rudisha, he will not win next year in Rio. Tuka was too far back in such a slow race - he needed a good honest race to have a chance to win. The Pole was done in by the Kenyan team tactics. Amos would have had a tough time in such a slow race as well.
If the field had gone out faster, 1.5 seconds or more, the race would have been very different. It's surprising Tuka medaled with the tactic he used in such a slow race. Had he been toward the front he likely would have kicked down Rudisha. Poor tactics in a slow race, very poor.
I think the team tactics were a huge factor in the race. Rudisha and Kipketer got to the front by 200, and slowed right down (25.x, 29.low) - anyone who wanted to get by them before the bell would have had to make an almost suicidal sprint, and would have had to keep going to the end - it probably would have been disaster for anyone who tried, but maybe that would have launched the race into high gear much sooner, and dragged people like Bosse and Tuka along. As it was, Tuka was still at least 12-15m down even at 500m, it seemed.
Kipketer played his wingman role well into the backstretch, but I thought he started to fall back a bit before 600m, as Rotich and Tuka began moving. I think the move that won it for Rudisha was him slamming the door on Kszczot when he tried to sneak by and grab the lead with 250m to go. Rusdisha responded and took back the inside line, Kszczot had to slow down, lost a couple of strides and never was able to get them back. Maybe Kszczot went too early. If he stayed right behind Rudisha, it would have opened up a bit around the final bend - Rotich challenged, but never got up to Rudisha, and there would have been room for Kszczot to swing out into space at the top of the homestretch...who knows...