Searching info about Ikeda rules, I encountered the SGF of a game

PB[Ikeda Toshio]
PW[Go Seigen]
KM[-4]
RE[W+11.5]
HA[3]
RU[Ikeda's Area Rules III]
GC[After the first pass, end on two successive passes.
In even games, if first pass is by W, subtract 0.5 point from B and give to W.
For 3 handicap stones, subtract 1.5 points and for last move add 0.5,
and add 2 points for 4 points komi (W thus needs at least 181.5 not to lose).]
...

Is it really possible under Ikeda's Area Rules III to have a nonintegral score while komi is integral?

The SGF says

SO[Ikeda's book]

but I think the translation of that book found on the net does not contain this game.

http://home.snafu.de/jasiek/rules.html

Read under Ikeda Style Rules and commentaries on the related rulesets incl. (Simplified) World Mind Sports Games (2008) Rules.

Is this a complicated way of saying 'No'?

It is an easy way to provide you some requested information about Ikeda Rules - and the correct answer No:)

Thanks! Does anyone know the correct data for this game?

Why don't you post the game record? Remove comments if that's a problem.

Or provide the URL.

_________________
The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

Everything with love. Stay safe.

I know about several versions, all incomplete. Logan (Go_Seigen_1d.pdf, p. 938) does not give the result.
The nonintegral RE looks like a mistake. Maybe the GC is mistaken as well?
If this is from a book about rules and counting I would not expect a semi-finished game.

(;
PB[Ikeda Toshio]
PW[Go Seigen]
KM[-4]
RE[W+11.5]
DT[Published 1992]
RU[Ikeda's Area Rules III]
GC[After the first pass, end on two successive passes.
In even games, if first pass is by W, subtract 0.5 point from B and give to W.
For 3 handicap stones, subtract 1.5 points and for last move add 0.5,
and add 2 points for 4 points komi (W thus needs at least 181.5 not to lose).]
SO[Ikeda's book on rules]
HA[3]
AB[dp][pd][pp]

;W[cd];B[ec];W[hc];B[cg];W[ed];B[dd];W[de];B[dc];W[be];B[fd] ...)

Thanks for posting the SGF file. I found the same game record in GoGOD, BTW.

There is a clue to the final fractional result in the Game Comment.

The comment neglects to add that for 4 points komi Black would subtract 2 points, while White would add 2 points. Why not just add 4 points to White's score? The answer, I think, is that the game was scored in the Chinese fashion instead of the Japanese fashion. If White needed 181.5 points for jigo, but had 193 points, then that would explain the 11.5 point win.

_________________
The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

Everything with love. Stay safe.

Yes, that makes sense. And apparently Chinese area scoring does not count handicap stones.
(At least Ikeda Area rules III do not: http://gobase.org/studying/rules/ikeda/?sec=e5020000.)
Still the question remains: can somebody find the original source?