Juan Carlos Diaz (juankafor)
Juan Carlos Diaz, better known online as juankafor, was a blitz battler from 2012 to 2017. His chess identity was built on volume, resilience, and an endless appetite for fast games. In just over four years he played nearly 10,000 rated blitz games, collecting 4,900 wins and reaching a peak blitz rating of 2091 (2012-10-28).
The Blitz Grinder
Although his listed preference was bullet, Diaz spent most of his energy in blitz. His adjusted blitz win rate sat near 50.5%, and he was almost impossible to keep down. His longest winning streak was 19 games, while his longest losing streak was 15, a pattern that shows how quickly he could bounce back. His comeback rate was a remarkable 91.53%, and even after losing a piece he still won 49.65% of the time. He rarely got blown off the board, with a one-sided loss rate of just 4.44%.
Opening Preferences
Diaz had clear opening tastes. With the white pieces he loved facing the Modern Defense, playing it 1,252 times in blitz and scoring an excellent 63.82%. As Black he was loyal to the Scandinavian Defense, entering 1.e4 d5 in 630 games and winning 54.76%. He also enjoyed the Center Game as White and embraced the Czech Defense in 742 games as Black. His battles were long and grinding, averaging about 65 moves per win and 71 moves per loss, and he reached endgames in 73.49% of his games.
Rivalries
No profile of juankafor would be complete without his epic rivalry with enzti. The two faced each other a staggering 4,147 times, with Diaz winning 2,325 of those games. Another major rival was lencho19, who narrowly edged their 1,054 game series 567 wins to 433. These marathon rivalries show how online chess can create genuine friendships, grudges, and endless rematches.
Legacy
Diaz was at his best at 18:00, when his win rate jumped to 58.02%, and Mondays were his strongest day. His favorite checking piece was the queen, which delivered more than 10,000 checks in analyzed games. Juan Carlos Diaz may not have been a titled master, but his blend of volume, fighting spirit, and stubborn resilience made him a true blitz marathoner.