Avatar of Ronen Har-Zvi

Ronen Har-Zvi GM

Username: OldweakGM

Location: Ramat-Gan

Playing Since: 2010-01-01 (Inactive)

Wow Factor: ♟♟♟♟

Chess.com

Daily: 774
0W / 1L / 0D
Rapid: 2392
10W / 7L / 4D
Blitz: 2743
200W / 69L / 26D
Bullet: 2901
462W / 211L / 39D

Grandmaster Ronen Har-Zvi (aka OldweakGM)

Ronen Har-Zvi is not just your everyday chess player—he’s a Grandmaster, a title that basically means he can outthink you before you even blink. Known online as OldweakGM, Ronen blends deep strategic insight with tactical fireworks, making opponents question their life choices one move at a time.

Career Highlights & Ratings

  • Peak Blitz Rating: 2917 (November 2020) - yes, that’s almost as quick as your morning coffee disappearing.
  • Peak Bullet Rating: 2901 (April 2025) - lightning-fast decisions with precision that would make even the fastest grandmaster envious.
  • Peak Rapid Rating: 2637 (July 2022) - a speed demon with a knack for mid-game mastery.
  • Daily Chess Rating: A humble 774, because sometimes slow and steady loses the thrill.

Playing Style & Stats

Ronen’s style is a thrilling rollercoaster: early resignation rate sits low at 5.43%, proving patience is a virtue. His endgames happen in 71.39% of games, showing he loves the gritty battles until the very end. On average, his wins and losses span around 68 moves—plenty of suspense for both sides.

White pieces? Ronen crushes with a 70.77% win rate. Black? Still hefty, at 63.91% — because even the dark side has its champions.

Known for tactical resilience, Ronen boasts a comeback success rate of 77.55%, meaning falling behind is just an invitation to unleash brilliance.

Record-Breaking Fun

Want numbers? He has clinched 319 wins in Blitz alone with an astounding 72.34% win rate in his secret opening (which remains, for now, top secret). Bullet chess? He stormed through 712 games, scoring wins in nearly 65% of attempts. Oh, and his longest winning streak? A jaw-dropping 19 consecutive victories – like a chess machine on fire.

The Human Behind the Pieces

Beyond the numbers, Ronen's approach is a blend of fierce determination and light-hearted wit (hence the playful username OldweakGM—never trust a name!). He's a true gladiator of the 64 squares, facing the grind of ratings, surviving tilt (with just a 5 tilt factor!), and finding his best game time at the unearthly hour of 4 AM. Clearly, chess waits for no one—not even sleep.

Recent Adventures on the Board

In his latest recorded triumph on April 20, 2025, in a Live Chess event, Ronen (playing White) showcased his mastery in an intense Reti Opening, claiming victory by resignation after a brilliant knight sacrifice that left his opponent no choice but to concede. His playstyle in that game perfectly sums up his career: patient, tactical, and always a few steps ahead.

So, next time you face Ronen Har-Zvi online, remember: the “old weak GM” label is just a clever disguise for one of the sharpest minds in chess history.


Coach's Avatar

What you’re doing well in your recent bullet games

You show a strong willingness to play active, tactical lines and to press for initiative even in fast time controls. Your games often feature active piece placement, open files, and quick exchanges that leave opponents with tough decisions under time pressure. You manage dynamic positions well when you have the advantage and know how to keep the attack going rather than stepping back too early.

  • You tend to seek active piece coordination, often using rooks on open files and timely knight or bishop maneuvers to press weaknesses in your opponent’s position.
  • You look for forcing moves and tactical motifs that create concrete chances, which is valuable in the bullet format where precise calculation matters under time constraints.
  • You adapt to different openings and still find practical, attack-oriented plans, which helps you stay uncomfortable for opponents who prefer quieter, positional games.
  • When the position becomes sharp, you maintain a fighting spirit and keep the pressure on rather than trading into passive lines.

Opening patterns and what they imply for your practice

Your results show you’re comfortable with aggressive, common bullet choices that lead to open, tactical middlegames. Notably, you’ve performed well in lines that offer quick central tension and open files.

  • Scandinavian and Caro-Kann families tend to give you active piece play and chances to seize the initiative. Consider continuing to refine two or three core ideas in these openings so you can execute plans quickly in bullet.
  • London System variants and other more solid setups can be reliable, but your win rate there is lower. It may help to treat those lines as a secondary toolkit and sharpen only a couple of familiar plans to avoid getting overwhelmed in fast games.
  • Build a compact opening repertoire with 2–3 go-to lines and a few well-understood middlegame plans so you can spend less time on move selection and more on accurate calculation in the critical moments.

Key areas to improve for stronger bullet performance

  • Time management and decision cadence: In bullet, set a mental clock for each phase of the game (opening, middlegame, endgame). Try to select a safe, solid candidate move within a few seconds and reserve longer calculation for the most forcing lines.
  • King safety and structure after early exchanges: Be mindful of heavy piece activity that can expose your king on open files. Prioritize quick king safety and avoid creating structural weaknesses that your opponent can target in the next move.
  • Calculation discipline in tactical melees: When the position is tactical, identify 2–3 forcing threats and only examine a couple of secondary ideas. This reduces overthinking and keeps you from getting tangled in too many branches.
  • Endgame conversion: Many bullet games end in simplified endings. Strengthen rook and minor-piece endgames through focused drills so you can convert small advantages into wins more reliably.
  • Pattern recognition in your main openings: Build a small, concrete “template” of typical middlegame plans for your two main openings. Knowing these patterns speeds up decision-making and reduces blunder risk in time pressure.

Practical practice plan for next steps

  • Choose 2–3 openings to own (for example, a Scandinavian/Caro-Kann family line and a robust London-like option as a secondary). Study 2–3 representative middlegame plans for each, so you recognize ideas quickly in bullet games.
  • Daily quick-tuzzle routine: solve 5–10 tactical puzzles under 1 minute to boost pattern recognition for forks, discovered attacks, and direct threats.
  • Bullet-specific time checks: during games, practice a 3–5 second initial scan of the board to spot immediate threats and checkmate nets, then commit to a first candidate move. Review your first 5 moves after each game to identify where you spent too long or rushed a decision.
  • Endgame micro-drills: spend 15–20 minutes per week on rook endings, king and pawn endings, and simple minor-piece endings to improve conversion in quick games.
  • Post-game notes: after each session, jot down one turning point in each game and one improvement you’ll try next time. If you faced a trap or a difficult decision, write down the right approach you would take next time.

Opponent tendencies to watch in future bullets

Pay attention to how your opponents handle open files and early piece trades. When your opponent tries to seize the initiative against your setup, your plan should be to consolidate quickly and look for precise, forcing moves that increase your practical chances on the clock. If you notice a recurring trap pattern in a particular opening, prepare a safe, tested reply to avoid getting caught in it.

  • Keep an eye on lines where your opponent invites you to overextend or chase material; force a simplification that keeps you in control of the key files and diagonals.
  • When you’re ahead in activity, avoid overconfidence and ensure you’re finishing with a clear plan (transform initiative into a concrete advantage, such as a target on a weak pawn or an exposed king).


🆚 Opponent Insights

Most Played Opponents
vycanismajoris22 5W / 5L / 1D
Timur Gareyev 3W / 5L / 2D
Arash Tahbaz 2W / 5L / 2D
Egor Baskakov 5W / 4L / 0D
javicio 8W / 1L / 0D

Rating

Year Bullet Blitz Rapid Daily
2025 2901 2743 2392
2024 2785 2691 2392
2023 2816 2692 2408
2022 2524 2865 2339
2021 2631 2845
2020 2841
2019 2609
2018 2766
2017 2542 2592 774
2016 2419 2602
2015 2415
2014 2449 2415
2013 1592 1853
2010 1811
Rating by Year2010201320142015201620172018201920202021202220232024202529011592YearRatingBulletBlitzRapid

Stats by Year

Year White Black Moves
2025 67W / 25L / 4D 62W / 32L / 5D 77.2
2024 8W / 3L / 0D 5W / 3L / 2D 63.6
2023 204W / 70L / 11D 195W / 76L / 17D 67.1
2022 15W / 4L / 3D 14W / 6L / 2D 74.7
2021 28W / 11L / 2D 20W / 20L / 6D 78.1
2020 9W / 3L / 1D 7W / 4L / 0D 79.9
2019 1W / 0L / 0D 0W / 0L / 0D 73.0
2018 1W / 1L / 2D 2W / 0L / 0D 79.2
2017 14W / 7L / 3D 15W / 8L / 2D 71.2
2016 53W / 12L / 5D 44W / 23L / 5D 71.6
2015 1W / 2L / 0D 2W / 1L / 0D 54.0
2014 7W / 1L / 0D 7W / 1L / 0D 60.9
2013 1W / 0L / 2D 2W / 2L / 0D 44.6
2010 7W / 1L / 0D 8W / 1L / 0D 57.0

Openings: Most Played

Blitz Opening Games Wins Losses Draws Win Rate
London System: Poisoned Pawn Variation 27 20 6 1 74.1%
Amar Gambit 24 21 3 0 87.5%
Caro-Kann Defense 23 18 2 3 78.3%
Sicilian Defense 18 12 5 1 66.7%
Colle System: Rhamphorhynchus Variation 17 13 3 1 76.5%
Barnes Defense 14 10 4 0 71.4%
Scandinavian Defense 11 7 3 1 63.6%
Amazon Attack: Siberian Attack 10 6 4 0 60.0%
Döry Defense 9 7 2 0 77.8%
Nimzo-Larsen Attack 9 6 3 0 66.7%
Bullet Opening Games Wins Losses Draws Win Rate
Caro-Kann Defense 66 45 17 4 68.2%
Colle System: Rhamphorhynchus Variation 46 29 14 3 63.0%
Amar Gambit 36 19 16 1 52.8%
London System: Poisoned Pawn Variation 23 13 9 1 56.5%
English Opening: Anglo-Indian Defense 21 15 5 1 71.4%
English Opening: Symmetrical Variation, Four Knights Variation 20 15 4 1 75.0%
Scandinavian Defense 20 16 3 1 80.0%
Hungarian Opening: Wiedenhagen-Beta Gambit 19 9 7 3 47.4%
Australian Defense 17 11 5 1 64.7%
Caro-Kann Defense: Exchange Variation 15 11 1 3 73.3%
Daily Opening Games Wins Losses Draws Win Rate
Amazon Attack 1 0 1 0 0.0%

🔥 Streaks

Streak Longest Current
Winning 19 1
Losing 5 0