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Sandro Mareco GM

sandromareco Buenos Aires Since 2014 (Active) Chess.com ♟♟♟♟♟
51.1%- 38.1%- 10.8%
Bullet 2534
33W 19L 1D
Blitz 2990
965W 734L 204D
Rapid 2535
25W 11L 12D
Daily 1467
3W 0L 0D
Coach Chesswick's Profile Photo
Coach Chesswick

Quick summary

Solid results in recent blitz: clean conversion of a pawn-run into a queen and a textbook mating net, plus a technical win creating and queening a passed pawn. The loss was a time-forfeit in a complicated middlegame. Overall strength-adjusted win rate (~0.52) and long-term rating history show you’re performing at a very high level — focus areas are mainly time management in blitz and some concrete middlegame cleanups.

Games to review (quick links)

  • Win vs basi1isk6 — clever queen/rook infiltration, promotion and mating net.
  • Win vs Jan Vykouk — excellent king/knight activity, created a passed pawn and queened it (see replay below).
  • Loss vs Lion-993 — flagged on the clock after getting into a messy middlegame with active enemy queen + rook. Time trouble was decisive.

Replay the promotion win (fast review):

What you did well

  • Creating and converting passed pawns: your game vs Jan Vykouk shows excellent technique — you traded into a favorable endgame and pushed the passed pawn convincingly until promotion.
  • Active piece play: you put rooks and queen on aggressive files and used infiltration (back-rank and seventh-rank ideas) to force decisive tactics.
  • Tactical alertness under pressure: in the checkmate win vs basi1isk6 you spotted decisive tactics (queen/rook checks and mating patterns) and finished cleanly.
  • Broad opening repertoire and practical results — your openings performance shows many lines with good win rates (e.g., Sicilian Closed, Modern, Nimzo-Larsen).

Where to improve (priority list)

  • Time management in blitz: the loss vs Lion-993 ended on time. You repeatedly went to single-digit seconds in complex positions — that cost you the game despite a playable position. Practice decisions that simplify when the clock is low.
  • Middlegame simplification plan: in Catalan/closed positions you sometimes get tangled in tactical complications. When equal-ish material and little time remains, aim to exchange into an endgame you know how to win or to simplify to reduce calculation load.
  • Pre-move and move-selection discipline: when low on time avoid speculative long tactical lines unless you see them clearly. Favor safe, improving moves that reduce opponent counterplay.
  • Specific tactical cleaning around queens/major pieces: a couple of games show near-misses where a deeper one- or two-move tactic would have improved evaluation earlier. Quick tactics training will sharpen this.

Concrete next steps (this week)

  • Do 20 minutes/day of tactics puzzles with a 3–5 second recognition target — focus on motifs you miss in blitz (pins, back‑rank, queen forks).
  • Play 10 games at 3+2 increment (not pure 3|0). The extra 2 seconds dramatically reduces flag losses and trains practical decision-making with increment.
  • Pick one opening you want to tighten for blitz (example: Sicilian Defense: Closed or Catalan Opening) and make a one‑page cheat sheet of typical middlegame plans and one tactical motif to watch for in each line.
  • Endgame drill: run 10 practice positions each day of king+pawn vs king and rook endgames where tempo and queening races matter — you convert passed pawns well, make it bulletproof.

Blitz-specific habits to adopt

  • If clock <10s: switch to "practical moves" — improving a piece, simplifying, or creating a single threat — rather than searching for the perfect tactic.
  • Use increment: when possible, play 3+2 or 5+3 in practice; you’ll learn to use the increment to “buy” one accurate move at critical moments.
  • One-second rule for candidate moves: if you can’t calculate a forcing sequence in 3–4 seconds, play the safe, improving move.
  • Pre‑game warmup: 5 tactical puzzles and one 5-minute game to get into rhythm before blitz sessions.

Opening notes from the recent games

  • Against the Sicilian structures (B46 Taimanov lines in the first PGN) you handled central breaks and used a queenside pawn advance to generate counterplay — keep the plan of ...d5 / ...d4 ideas in your notes for these lines.
  • In the Catalan/closed game that ended on time, you had dynamic chances after Bxf6 gxf6 and central pressure — prepare typical tactical responses to queen + rook activity so you don't need to spend huge amounts of time calculating them over the board. See your one‑page cheat sheet.

30‑day practice plan (compact)

  • Days 1–10: Tactics 20 min/day + 3× 3+2 games. Focus: pattern recognition (forks, pins, back‑rank).
  • Days 11–20: Endgames 15 min/day + opening review (one page) for one opening you play often. Play 5× 5+3 games.
  • Days 21–30: Mixed — 10 tactical puzzles, 10 endgame drills, 5× 3+2 games. Track flag losses: aim to cut them by 75%.

Final notes & encouragement

You already have the technique and tactical sense to beat strong opponents — your conversion and queen/rook coordination are excellent. The fastest rating gains in blitz will come from shaving off flag losses and making quicker, practical decisions under time pressure. Small disciplined changes (increment practice, a one‑page opening plan, targeted tactics) will pay immediate dividends.

If you want, I can:

  • Generate a 1-page cheat sheet for the Sicilian Closed and your Catalan lines.
  • Create a targeted 14-day tactics set based on the motifs that cost you time in these games.
  • Annotate one of these recent games move-by-move focusing on clock and decision moments (ideal for practice with increment).

Which of those would you like first?


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