Before the Cubs won this last World Series, they had not won it since 1908.
Some have argued that they might have won it again in 1909 (and maybe more) had it not been for Kling "leaving baseball" to play pool..
from wiki:
Although he once again told Cubs' management he was considering giving up baseball for pool before the 1907 season,[13] he once again returned to play for the Cubs, who won the World Series in both 1907 & 1908. Then, in early 1909, after several solid years with Chicago, he engaged in another dispute with the management over salary and this time decided to spend some time away from the club.[14] During that time he continued to compete in pool, winning the world billiards championship, and played semi-pro baseball with a Kansas City team. He sat out the entire 1909 season, and in early October competed against Charles "Cowboy" Weston and won the world's championship of pool.[15] When he decided to come back to baseball in early 1910 and asked to be reinstated, a debate ensued as to whether he should be permitted to return since he had not honored his contract during the 1909 season. National League President Thomas J. Lynch wanted him fined or possibly traded; in the end, he was fined $700 and allowed to return.[16] His love for both pool and billiards led him to not only play competitively, but to organize a league which was called the National Amateur Three-Cushion League. It had teams from eight cities, Kansas City, Chicago and St. Louis among them.[17] He told reporters that when his baseball career was over, he would devote himself to pool and billiards full-time.[18] And despite his often-divided loyalties, baseball writers agreed that Kling was among the best players of his era; in fact, his obituary described him as "one of the greatest catchers the Chicago Cubs ever had".