Overview
Cornelis Klaver (also known online as CoachHakia) is a Dutch National Master and energetic chess streamer known for blistering bullet games, sharp opening play, and a habit of narrating traps like a stand-up routine. A regular on the fast time controls circuit, Cornelis combines practical over-the-board instincts with a streamer’s flair — teaching, trash-talking (gently), and rattling off tips between clicks of the mouse.
Career & highlights
Cornelis rose through online ranks with a steady diet of bullet and blitz play, earning the National Master title and a reputation for crushing time scrambles. He’s logged thousands of rated games across Bullet, Blitz, Rapid and Daily — with impressive streaks, frequent comebacks, and a particular knack for winning under extreme time pressure.
- Title: National Master (National)
- Preferred time control: Bullet — the kinetic, caffeine-fueled arena where Cornelis shines
- Streamer: regular live sessions where instruction meets entertainment
- Peak performance snapshot:
- See an at-a-glance rating trend:
Playing style & strengths
Cornelis’s games read like action movies: quick, decisive, and occasionally cinematic. He favors tactical complications and practical choices that capitalize on opponents’ time trouble. Despite the speed, his endgame frequency shows he’s not afraid to grind when the clock allows.
- Style: tactical, practical, fast — excels in time scrambles and practical decisions
- Early resignations happen sometimes (it’s a bullet thing), but when engaged he plays long, purposeful wins
- Best hours: often lethal in morning sessions — peak performance tends to gravitate around 09:00
Openings & preferences
Cornelis prefers lively, sometimes offbeat systems that keep opponents uncomfortable early. He mixes mainstream theory with surprise weapons and has built strong win rates with several niche lines.
- Common favorites: Scandinavian Defense, London System: Poisoned Pawn Variation, Colle setups and the occasional Amar/Amar Gambit in bullet
- Notable tendencies: aggressive treatment of the center, creative piece play, and a willingness to accept imbalanced positions
- Top opening performances are often in fast games — he’s turned traps into teaching moments on stream
Streamer & personality
On stream as CoachHakia, Cornelis mixes short lectures, rapid post-mortems, and playful banter. New viewers can expect practical tips for bullet improvement, honest commentary on blunders, and occasional jokes about losing on time despite being winning on the board.
- Format: live bullet and blitz sessions with chat interaction
- Teaching style: hands-on, digestible, and infused with humor
- Community vibe: constructive, lively, and welcoming to players aiming to get better quickly
Quick sample game
A tiny demonstration of Cornelis’s bullet philosophy: fast development, tactical fireworks, and a punchline finish. Try replaying this one on the stream board.
Replay (autoplay example):
Fun facts & talking points
- Nickname online: CoachHakia — so if you see that name in chat, you’ve found Cornelis.
- Great at practical play: he often outperforms expectation in fast time controls against higher-rated opponents.
- Favors Scandinavian lines — check out his deep familiarity with the Scandinavian Defense.
- Streamer-level humor: describes blunders as “creative repositioning” and losses as “teaching donations.”
Where to watch & follow
Cornelis streams as CoachHakia — expect bullet marathons, coaching snippets, and the occasional themed event. If you’re improving at blitz or bullet, his channel is a practical, entertaining classroom.
- Look for live sessions under the username CoachHakia
- Community: friendly, improvement-focused, and full of in-game banter