Charts and tables.
 The two-card flop compared:

The effect of dealing two cards at the second round can be easily seen in the following chart, which compares the percentage chances of improving a pair, or an ideal straight or flush holding at the second round in the three major games -7-stud, holdem and omaha - and five-card stud, alligator stud and mississippi.  The figures for all stud games are based on there being  no required cards exposed in other hands in an eight handed game.

Chances of second round improvement

               5cs................alligator..............7cs..............holdem............omaha...........mississippi
Figures used in this chart are in this table.  In alligator stud the cards come 2-2-1-1, or
more precisely, (1)1+2+1+1, in mississippi they come 3-2-1-1 or (2)1+2+1+1. The captions may not be aligned to the chart due to varying font sizes
 
Chances of second round improvement 
  improve 
a pair 
make 4th 
to straight 
make 4th 
to flush
 straight 
on flop
flush 
on flop
(1)1+1+1+etc. 5 & 6-card stud  5% 
(1)1+2+1+1 alligator stud 17% 5% 6%
(2)1+1+1+1+(1) 7-card stud  12.5% 19% 24%
 (2)+<3+1+1> holdem  12 %  9%  11%  1.5%   <1%
(2,2)+<3+1+1> omaha 12%  23% 22%  4% <2%
(2)1+2+1+1 mississippi 28%  35%,  42% 5.4%  5%
(2,1)1+2+1+1 murrumbidgee 40%  64% 42% 12%  5%
Cards in angle brackets 
are communal.
Cards in italics are  
not live at the end.
Figures for 5-stud, holdem and omaha 
are for trips only.
Cards in bold type 
must be used
 
 Mississippi and holdem, flops for selected hands: no required cards are in sight in mississippi.
Start with and make: mississippi holdem
suited cards, flop 4th 42% 11%
suited cards, flop flush 5% 1%
straight cards, flop 4th  35% 9%
straight cards, flop straight 5.4% 1.8%
Pair, make two pair (any) 20% doesn't help
Pair, flop trips  9% 12%
Pair, flop full house 1% 0.73%
Pair, any improvement 28% 12%
No pair, make pair. 46% 33%
No pair, make 2 pair or better 4% 3.5%
No pair, make trips or better 1% 1.4%
 
If any of these figures are incorrect please let me know at [email protected] ... Remember though, the figures for mississippi are based on there being no dead cards in the seven visible in opponents' hands.

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