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IM Jakob

2870
Standard
2290
Blitz
2426
Blindfold

Hi, I am the creator of kaizen64. Hope you enjoy working on your calculation skills on here! :) If you have ideas for new features or notice any bugs, I'd appreciate a post on the Feedback page. Thanks!

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#DateMPRKTOff ΔTime
1553 26-10-15 S 2561 — — ✓ +6.1 2:42 ↗
1552 26-10-15 S 2511 — — ✓ +4.9 3:30 ↗
1551 26-10-15 S 2562 — — ✗ −35.2 7:17 ↗
1550 26-10-15 S 2718 — — ✓ +11.6 6:33 ↗
1549 26-10-15 S 2383 Mate in 5+ −100 ✓ +1.4 0:27 ↗
1548 26-10-15 S 2340 Mate in 5+ −100 ✓ +1.1 1:09 ↗
1547 26-10-15 S 2365 Mate in 5+ −100 ✓ +1.3 0:24 ↗
1546 26-10-15 S 2297 Mate in 4 −200 ✓ +0.5 0:31 ↗
1545 26-10-15 S 2373 Mate in 4 −200 ✓ +0.8 1:02 ↗
1544 26-10-15 S 2424 Mate in 4 −200 ✓ +1.0 0:49 ↗
Full puzzle history (1553 attempts) →
#DateMPRKTOff ΔTime
3230 26-10-15 B 2373 — — ✓ −1.4 0:41 ↗
3229 26-10-15 B 2307 — — ✓ −5.7 0:41 ↗
3228 26-10-15 B 2381 — — ✓ +13.5 0:11 ↗
3227 26-10-15 B 2419 — — ✓ +8.4 0:20 ↗
3226 26-10-15 B 2347 — — ✗ −8.2 1:35 ↗
3225 26-10-15 B 2257 — — ✓ +11.0 0:09 ↗
3224 26-10-15 B 2256 — — ✓ +0.9 0:19 ↗
3223 26-10-15 B 2400 — — ✓ −4.3 2:27 ↗
3222 26-10-15 B 2238 — — ✓ −2.0 0:23 ↗
3221 26-10-15 B 2270 — — ✓ +10.8 0:10 ↗
Full puzzle history (3230 attempts) →
#DateMPRKTOff ΔTime
58 26-10-13 X 2201 — — ✓ +6.3 2:53 ↗
57 26-10-13 X 2292 — — ✓ +9.6 5:22 ↗
56 26-10-11 X 2206 — — ✓ +7.1 6:29 ↗
55 26-10-11 X 2229 — — ✓ +8.2 8:06 ↗
54 26-10-07 X 2468 — — ✓ +18.4 6:20 ↗
53 26-10-07 X 2337 — — ✓ +13.9 3:57 ↗
52 26-10-07 X 2328 — — ✓ +14.5 4:46 ↗
51 26-10-07 X 2341 — — ✓ +16.1 5:43 ↗
50 26-10-07 X 2442 — — ✓ +21.9 5:40 ↗
49 26-10-07 X 2451 — — ✗ −10.7 3:08 ↗
Full puzzle history (58 attempts) →

Performance by Theme

Checkmates (n = 618) 2860
Endgames (n = 746) 2648
Defence & quiet play (n = 344) 2660
Middlegame Tactics (n = 354) 2661
1000 3000
Fork (n = 136) 2628
Pin (n = 135) 2699
Deflection (n = 106) 2655
Attraction (n = 218) 2745
Discovered Attack (n = 84) 2902
Intermezzo (n = 21) 2734
1000 3000
Rating
Performance rating on puzzles carrying that theme: the average difficulty faced, plus a bonus for the score.
n
Attempts behind the figure. Themes with almost none are left out.
Bars
Start at 1000, not zero, so differences stand out.
Colour
Bars run from green at this solver's strongest reliable figure down through yellow to red 600 points below it, so the shade shows how far each one trails their best. Faint entries above that top out at green: a flawless run on a handful of puzzles is at least as strong, but by how much cannot be said. The scale is per solver and per tab.
Faint
Fewer than 25 attempts — treat with caution.

Training Difficulty

2527
TWPR
0.74
TOS
2322
APR
0.87
SR
2426
2654
2949
2841
2701
2800
2783
1300 1600 1900 2200 2500 2800
easierharder
28.8 h measured, from 75% of attempts — the rest have no recorded solve time.
2426
2654
2252
2741
2699
2786
2735
1300 1600 1900 2200 2500 2800
easierharder

Difficulty Trend

Columns
Fixed rating bands, the same ranges the trainer offers. Share of each band, split into solved and missed. Numbers on the axis mark the band boundaries.
Time Spent
Weighted by time spent rather than puzzles solved. Thirty quick warm-ups outnumber three hard puzzles but take less of the clock, so this is the better measure of where effort went.
Figures
The four numbers above stay put whichever tab is chosen. TWPR and TOS are weighted by time: each puzzle's rating weighted by the time spent on it, and the share of time that went into puzzles that were solved. APR and SR are the per-puzzle equivalents, counting every attempt once. The pairs only diverge when a solver's time falls unevenly across difficulties.
Under
Performance rating for that band; italic when it rests on too few attempts.
Trend
Average rating attempted per week, against this solver's overall average of 2322.