L-trominoes on board
Source: Russian TST 2015, Day 10 P1 (Group NG), P2 (Groups A & B)
April 21, 2023
combinatoricsboard
Problem Statement
A chessboard is given, the cells of which are painted white and black alternatively so that the corner cells are black. There are [url=https://i.stack.imgur.com/V1kdh.png]L-trominoes placed on the board, no two of which overlap and which cover all of the black cells. Find the smallest possible value of .