Tactical training is the fastest path to chess improvement for players up to the intermediate level. Research in chess pedagogy consistently shows that pattern recognition — the ability to quickly identify tactical motifs in a position — is more important than strategic knowledge for winning games. Every chess game contains tactical moments. Even quiet, strategic positions hide potential tactics that can explode if one side makes an error. By playing many games against AI opponents, you naturally encounter thousands of tactical positions. The key is to approach each game with a tactical mindset: on every move, ask yourself "is there a combination here?" Over time, this habit becomes automatic. Our AI opponents at medium to hard difficulty provide particularly good tactical training because they play strongly enough to create complex positions but occasionally create weaknesses you can exploit. The undo feature is invaluable for tactical training — when you spot a tactic after making a different move, you can go back and play the combination to reinforce the pattern.