Below is a real report (with the username changed) for a player rated 1284 Rapid on chess.com, last 100 games over 6 weeks.

Primary archetype: Endgame-Soft (78% confidence)

The signature is unmistakable. Kevin’s endgame ACL is nearly 3x his middlegame ACL. His conversion rate from “winning at move 40” to “won the game” is 38% — a ~1500-rated player at his rating band typically converts 55-65%. Twelve of his 46 losses were positions where the engine rated him +1.0 or better at some point after move 35.

Secondary archetype: Tactically-Blind (19% confidence). Six of his losses were single-move tactical oversights, mostly in late middlegame. Worth tracking but not the priority.

Personalized 30-day plan

1. Memorize 8 essential endgames from Silman: K+P vs K (key squares), Lucena, Philidor, R+P vs R, opposite-color bishop draw, queen vs pawn on 7th. 20 min/day.
2. Drill 5 endgame studies/day on chess.com endgame trainer. Track puzzle rating; target +200 by day 30.
3. Switch to 15+10 time control for the next 50 games. The increment forces you to play out endgames instead of flagging.
4. Behavioral rule: in any endgame past move 40, take 30 seconds before any pawn move. Pawn moves are irreversible; that’s where wins are blown.
5. Re-run MyChessPlan analysis after 50 games. Target: endgame ACL below 80, conversion rate above 50%.

Repertoire flags

• Italian Game (White): healthy. 58% win rate, post-opening eval +0.3 average. Keep playing.
• Caro-Kann (Black vs e4): healthy. 52% win rate.
• Slav (Black vs d4): weak — 38% win rate, post-opening eval -0.6 average. Suggest switching to QGD Orthodox or learning the Slav main line to move 12.

Three games to review

The most instructive losses for Kevin’s archetype:

• Game 47 — winning at move 38 (+1.4), drew because of a careless king move. Classic endgame technique error.
• Game 62 — equal R+P endgame, lost in 80 moves to passed-pawn race. Lucena would have saved the half-point.
• Game 78 — pure pawn endgame at move 50, lost to opposition. Should be a forced study.