Trainer Routines Leaderboard Teams About Feedback

IM Jakob

2694
Standard
2252
Blitz
2395
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!

M
T
W
T
F
S
S
0
#DateMPRKTOff ΔTime
1400 26-10-10 S 2713 — — ✗ −14.1 0:47 ↗
1399 26-10-10 S 2866 — — ✗ −8.8 17:08 ↗
1398 26-10-10 S 2630 — — ✗ −19.1 1:50 ↗
1397 26-10-10 S 2722 — — ✗ −16.3 10:28 ↗
1396 26-10-10 S 2449 Mate in 5+ −100 ✓ +2.9 0:09 ↗
1395 26-10-10 S 2353 Mate in 5+ −100 ✓ +1.8 0:15 ↗
1394 26-10-10 S 2452 Mate in 5+ −100 ✓ +3.0 0:59 ↗
1393 26-10-10 S 2462 Mate in 4 −200 ✓ +1.9 0:11 ↗
1392 26-10-10 S 2257 Mate in 4 −200 ✓ +0.6 0:09 ↗
1391 26-10-10 S 2336 Mate in 4 −200 ✓ +0.9 0:12 ↗
Full puzzle history (1400 attempts) →
#DateMPRKTOff ΔTime
2450 26-10-09 B 2279 — — ✓ +1.3 0:28 ↗
2449 26-10-09 B 2256 — — ✗ −10.4 0:22 ↗
2448 26-10-09 B 2281 — — ✓ +2.3 0:25 ↗
2447 26-10-09 B 2260 — — ✓ +6.9 0:24 ↗
2446 26-10-09 B 2364 — — ✗ −7.4 0:11 ↗
2445 26-10-09 B 2413 — — ✓ +6.8 0:18 ↗
2444 26-10-09 B 2371 — — ✓ +2.0 0:40 ↗
2443 26-10-09 B 2380 — — ✓ −1.8 0:43 ↗
2442 26-10-09 B 2348 — — ✓ +4.6 0:23 ↗
2441 26-10-09 B 2244 — — ✓ −0.4 0:28 ↗
Full puzzle history (2450 attempts) →
#DateMPRKTOff ΔTime
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 ↗
48 26-10-01 X 1338 — — ✓ +0.1 0:23 ↗
47 26-10-01 X 1315 — — ✓ +0.1 0:29 ↗
46 26-10-01 X 2327 — — ✗ −16.8 0:43 ↗
45 26-10-01 X 1323 — — ✓ +0.1 0:51 ↗
Full puzzle history (54 attempts) →

Performance by Theme

Checkmates (n = 556) 2832
Endgames (n = 675) 2630
Defence & quiet play (n = 304) 2650
Middlegame Tactics (n = 323) 2661
1000 3000
Fork (n = 124) 2612
Pin (n = 121) 2693
Deflection (n = 92) 2631
Attraction (n = 203) 2727
Discovered Attack (n = 75) 2866
Intermezzo (n = 18) 2679
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

2519
TWPR
0.72
TOS
2313
APR
0.87
SR
2426
2654
2949
2808
2688
2797
2815
1300 1600 1900 2200 2500 2800
easierharder
23.1 h measured, from 72% of attempts — the rest have no recorded solve time.
2426
2654
2252
2725
2688
2782
2759
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 2313.