The position has proceeded in Bishop-exchanged Double Reclining Silver. Watanabe for
About ten moves later from Diag.1, the position became Diag.2.
From here, it proceeded with ▲R-69 △R-62 ▲R-59 △R-92 (Diag.3)
At a glance, this rook's movement looks strange. But, there is a deep meaning behind ▲R-59 and △R-92.
To put it simply, in Diag.2,
Here, if the gold's position is
In Diag.3, although ▲S-47 △R-62 ▲P-56 △B*64 is the common line, challenger Gouda thought the other attack line from ▲P-45 after moving the rook to 48 Today's final position is Diag.5.