Scouting report: Joshua Daniel Ruiz Castillo (GM, COL)

1,495 over-the-board games in the Chess Stalker database (1,377 classical, 46 rapid, 72 blitz): 52% wins, 23% draws, 25% losses. FIDE rating 2466 standard, 2465 rapid, 2491 blitz. 295 games analyzed with Stockfish: 93% accuracy, 0.05 blunders per game.

  • Opening repertoire of Joshua Daniel Ruiz Castillo as White and Black, with results per line — free.
  • Weaknesses and blunder patterns, evaluated with Stockfish — free.
  • Recent over-the-board games and endgame statistics.
  • Twin Bot: a sparring bot that imitates Joshua Daniel Ruiz Castillo's style so you can rehearse the matchup — free online.

Full report: https://chessstalker.com/fide/4400704 — no account needed.

Joshua Daniel Ruiz Castillo

GM

Colombiaborn 1997FIDE ID 4400704

Rating & statistics

FIDE rating lists · Sep 2023 – Sep 2026
2400
2440
2480
2520
2434 · Sep 2023
Oct
2024
Apr
Jul
Oct
2025
Apr
Jul
Oct
2026
Apr
Jul
Oct
Sep 2023Oct 2026
2491
2466
2465
2510peak, Feb 2020
1,495games
784wins, 52%
338draws, 23%
373losses, 25%

Play style

before facing them
Elite accuracy: 93.1% average
High resilience (62%): Dangerous even when losing
Solid conversion: 93%
Very consistent (86%)
Very precise: only 0.1 blunders/game
Dominates 1.e4 as ♔ (67% in 580 games)

Play against Ruiz Castillo's Twin

Their real openings, level & style

Based on 1,495 games

Openings

1,495 games

Weaknesses

where they slip as ♔ White

No significant weaknesses detected as white

Strengths

what holds up for them as ♔ White
Scotch: Classical1.e4 e5 2.f3 c6 3.d4 exd4 4.xd4 c514 games, last played 11 years ago71.4%wins
Pirc Defense1.e4 d6 2.d4 f614 games, last played 7 years ago71.4%wins

Deep analysis

Stockfish · Classical · 295 analyzed
Accuracy by phase
Opening
95.8%
Middlegame
93.2%
Endgame
95.5%
Clutch factor
+5%
Winning (+2)
94%
Equal
94%
Losing (−2)
89%
Problematic pieces
23%
59 err
19%
47 err
18%
45 err
17%
43 err
15%
37 err
8%
21 err
Critical moment
Move 44 avg
0%
1-15
0%
16-25
43%
26-35
21%
36-45
36%
46+
43% of blunders occur after move 26-35. Keep tension until then.
Error heatmap · Critical squares
15
Few
Many
g4
15
e4
9
e5
9
f3
9
f4
9
g4/e4 concentrate most errors. Force decisions in those zones.

Critical blunders

10 errors
#76
c7?? vs Gonzalez Zamora
Endgame · OTB · 2025
#51
b7?? vs Matviishen
Endgame · OTB · 2025
#87
a5?? vs Hidalgo Diaz
Endgame · OTB · 2025
#29
f4?? vs Qin
Middlegame · OTB · 2025
#42
g8?? vs Ostrovskiy
Endgame · Blitz · 2024
#25
g4?? vs Albornoz Cabrera
Middlegame · Blitz · 2024

Recent games

Gutierrez Delgado, Yusuan A.(2299)

XXXV Torneo Internacional... · 19 Dec 2025

1–0
Chale Cen, Alessandro Isai(1582)

XXXV Torneo Internacional... · 19 Dec 2025

1–0
Diaz Rosas, Julio Cesar(2368)

XXXV Torneo Internacional... · 19 Dec 2025

1–0
Quesada Perez, Luis Ernesto(2552)

XXXV Torneo Internacional... · 19 Dec 2025

0–1
Gutierrez Delgado, Yusuan A.(2299)

35th Carlos Torre Memoria... · 19 Dec 2025

1–0
Cori, Jorge(2599)

Carlos Torre Mem Blitz · 19 Dec 2025

0–1

Endgame statistics

Repertoire

PRO
1,495 games in scope
8
7
6
5
4
3
2
1a
b
c
d
e
f
g
h
754 games57%W22%D21%L
Move
1. e4
5809m
57%2221
67%
1. b3
819m
62%1721
70%
1. f3
659m
51%34%15
68%
1. d4
239m
65%1322
72%
1. c4
39m
33%67%
67%
1. g3
26y
100%
100%

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