1. 
   Head to Head
   In this type of poker game, only two players may participate.
   Found op http://www.internet-poker.co.uk/Poker-Glossary/
   
   
2. 
   Head-to-Head
   playing the dealer one-on-one with no other players at the table.
   Found op http://www.blackjacktactics.com/blackjack/terms/
   
   
3. 
   headtohead
   1) Kind of encounter 2) Slug it out 3) Way to battle
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/headtohead/1
   
   

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