World Sudoku & Puzzle Championship 2026
ISC & SM and IPC & PR 2026

Jon Chang

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Real name Jon Chang
Puzzle Blog
Country Singapore
Date registered2021-11-04 7:36 AM
Last logon2026-04-13 8:36 AM
Total posts
Rank
LMI RatingsCurrent RankCurrent RatingsBest RankBest RatingsRatings History
LMI Puzzle Ratings 465 164.1592 309 322.0779 History

Puzzle Testjonn's Rankjonn's ScoreTest Max ScorePSRSNSW
2026R4 (Shading & Loops) 215 11 132.8 154 177 160 1
2026R3 (OP & Regions) 257 10 125.3 111 123 114 1
2026R1 (Classics) 294 21.8 132.033 253 272 258 0.8
2024R1 (Classics) 306 18 128.45 281 334 294
2023R6 (Regions & Loops) 162 37 137.983 364 316 352
PANFOPCWHTTAPA 3 174 101.867 149.6 436 366 419
2022R3 (Regions & Evergreens) 231 14 128.517 159 78 139
2022R2 (Casual & Word) 245 10 109.25 143 108 135
2022R1 (Classics) 300 33 143.133 237 198 227
PANFOPCWHTTAPA 2 353 56 148.717 268 195 250
2023R1 (Classics) 351 0 131.483
Sudoku Testjonn's Rankjonn's ScoreTest Max ScorePSRSNSW
2022R4 (Math & Irregular) 219 34 145.7 358 352 357

PS = Prorated Score (Score based on players's score, median score and top score in the test)
RS = Rank Score (Score based on player's rank in the test)
NS = Normalized Score (.75 * PS + .25 * RS)
W = Weight of the test
Click here for detailed logic of LMI Player Rating System v2.0