(;GM[1]FF[4]SZ[28:19]
GN[Most problems use these ways (rotated and possibly reaching beyond the board) to prevent squares from being formed.]
PC[https://senseis.xmp.net/?TwoSquares]AP[GoWiki:2009]
DT[2019-09-15]
C[Diagram from https://senseis.xmp.net/?TwoSquares

Most problems use these ways (rotated and possibly reaching beyond the board) to prevent squares from being formed.]
PL[B]

AB[ci][fi][hi][ji][ti][{i][pj][qj][tj][zj][lk][{k]
AW[bi][di][gi][ki][li][ni][oi][pi][qi][si][ui][vi][xi][yi][zi][bj][dj][fj][hj][jj][lj][nj][sj][vj][xj][{j][bk][ck][dk][fk][gk][hk][jk][kk][nk][ok][pk][qk][sk][tk][uk][vk][xk][yk][zk]


;
)
