It belongs to the family of non-transitive games in which choosing second is not a disadvantage, but rather a way of responding to the rival sequence with a better one.

Penney's game

Strategist
Master plays

Riddle statement

Two players take turns choosing a sequence of three coin outcomes.

Then a fair coin is tossed repeatedly until one of the two sequences appears for the first time as a consecutive block.

Whoever chose that sequence wins.

The first player has chosen:
heads, heads, heads

You choose later.

Which sequence should you choose to maximize your chances of winning?