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This version of Toppa is played in the Ishikari Subprefecture in Hokkaido. It is described as “Bakappana but with Teyaku”.
Since it has a Join-in/Drop-out phase just like in Hachi-hachi, it is assumed the game is played by more than 3 players, but only 3 players participate in the round at once.
The dealing method is the same as in Hachi-hachi; 7 cards in each hand, and 6 cards on the field.
Not much details has been attested, except for the following.
After the dealer has given the cards to each player, each player decides whether to Join in the round, or Drop out.
Only 3 players can join-in the round, but even if 3 players have declared to join-in already, the forced-out players may chase [追う - ぼう, bou], by declaring to join-in as well.
Unlike in Hachi-hachi, there’s no fee for Dropping out, nor are there any compensation for Forced-out players.
If there are only two players to begin with, then the above Join-in/Drop-out phase is skipped.
If more than 3 players have declared to join-in, then all payments for the next round will be doubled.
If during the next round, more than 3 players declared to join-in again, then all payments for the next round will be tripled, and so on…
The list of Teyaku has not been attested. (NEEDS MORE DOCUMENTATION)
The Teyaku list could be either of the following:
In the former case, the differences are the following: