Merits of playing multiple tables

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I think the majority of winning players will see their BB/100hands decrease per table.

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This is more of a statement concerning BB/Hr than BB/100.

Your BB/100 will almost certainly decrease by playing multiple tables unless you don't pay much attention when you play one table anyway. But as long as it doesn't feduce by a factor greater than thr number of table you are playing, then adding another table is still +EV.

For example if you make 4BB/100 playing 1 table and when you play 2 tables you only make 3BB/100 thats good becasue you are now seeing twice as many hands and are making 6BB/200 so have essentially increased your winrate by 50%.

Now if you add a 3rd table and your rate drops to 2BB/100 you are making 6BB/300 which is the basically the same as with 2 tables so its not worth adding this 3rd table.

I hope that makes sence.