English Earning money on Polish corridors, just as on ordinary ones, occurs through the event result “hitting” both (and sometimes more) oppositely directed outcomes.
Example of a simple corridor: there are two bets: Over 0,5, odds 2,05, and Under 1,5, odds 2,50.
If exactly one goal is scored in the specified match, this score will fall under both outcomes, which means that the player who bet on them would seemingly receive their winnings twice. This is what hitting the corridor means.
In the case of Polish corridors, the calculation method is more complicated (it is described in detail on the page describing Polish corridors).