I play tetris too (hkgwife)

Race #13005

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Official speed 110.80 wpm (31.30 seconds elapsed during race)
Race Start May 30, 2018 1:10:25pm UTC
Race Finish May 30, 2018 1:10:56pm UTC
Outcome No win (2 of 4)
Opponents 1. mark40511 (111.57 wpm)
3. kelvinjay (106.34 wpm)
Accuracy 98.0%
Points 77.56
Text #3622410 (Length: 289 characters)

When analyzing images, constraint propagation works because relevant surface properties change slowly almost everywhere. Surface distance and surface direction can change rapidly at edges, of course, but edge points represent only a relatively small number of the points in an image array.