Depends how much stock you put into Krillin's sparring session with Goku just before the ToP.
"War is primarily a game of skill.
It is a contest of mind matched against mind, tactics matched against tactics.
But there is also an element of chance that is more suited to games of cards or dice.
A wise tactician studies those games, as well, and learns from them.
The first lesson of card games is that the cards cannot be played in random order.
Only when laid down properly can victory be achieved."