Kosumosu Yamanaka

Kosumosu Yamanaka first appeared on the international poker scene in 2016 when he made his live tournament debut at EPT Monte Carlo. This event marked the beginning of his journey as a Japanese player competing at the highest levels. Over the next few years, he built a reputation for steady performances in high-roller fields.

2019 PokerStars Red Dragon Jeju

Yamanaka participated in two high-profile events at the 2019 Red Dragon Jeju series in Korea. In the ₩10,000,000 Super High Roller (91 entries, prize pool ₩829,738,000 KRW), he was eliminated in a key hand against Lester Edoc. Yamanaka held A♦T♠ and Edoc had K♥Q♣; the board ran out dry and Yamanaka was sent to the rail. During the same series, Yamanaka also played in the ₩5,000,000 High Roller (155 entries, prize pool ₩684,093,000 KRW). At one point during Day 2, he was noted to have a stack of 90,000 chips (15 big blinds) amid a field that included chip leaders Yiqing Huang and Ye Yuan.

2023 EPT Monte Carlo Main Event Cash

In 2023, Yamanaka returned to the site of his debut – Monte Carlo – for the European Poker Tour stop. He entered the €5,300 Main Event and successfully cashed, finishing in 16th place for €8,700. This marked his first ever cash in an EPT Main Event and demonstrated his ability to navigate a large field of international players. The result placed him 16th among the 24 Japanese players who cashed at the festival.

Based on observable tournament footage and results, Yamanaka tends to play a solid, fundamentals-based game. In the Red Dragon hand where he was eliminated, he moved all in from the hijack with A♠T♦ – a standard shove at 15 big blinds. His opponents in the high-roller fields are often aggressive, but Yamanaka has shown the discipline to wait for favorable spots. His career earnings, while modest compared to top pros, reflect a player who consistently competes in buy-ins ranging from $1,500 to over $10,000, often in Asian and European series.

As one of the earlier Japanese players to venture into the European Poker Tour, Yamanaka has inspired a new wave of Japanese grinders. His steady accumulation of cashes across different continents shows that a patient, math-oriented approach can succeed even in high-variance events. Though he has not yet won a major title, his consistent presence at the final tables of large fields marks him as a respected figure in the Japanese poker community.