[what is this?]

[what is this?]

Blunder check: Alexander McDonnell The average percentage of erroneous moves at the threshold 0.33: 14.4% 20 games, 1831-1834 Blunder check: Francois Andre Philidor The average percentage of erroneous moves at the threshold 0.33: 21.0% 7 games, 1749-1790 Blunder Check: Louis Charles De La Bourdonnais The average percentage of erroneous moves at the threshold 0.33: 12.3% 18 games, 1834-1838 Blunder Check: Paul Morphy The average percentage of erroneous moves at the threshold 0.33: 10.0% 31 games, 1849-1859 Blunderchecked games I This game collection is mainly supposed to demonstrate how the quality of play has improved during the history. Figures above each game mark the percentage of inaccuracies. 33 games, 1839-1858 Blunderchecked games II This game collection is mainly supposed to demonstrate how the quality of play has improved during the history. Figures above each game mark the percentage of inaccuracies. 45 games, 1845-1882