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MatPlus.Net Forum General Four corner rook

### Four corner rook

The idea of a four corner rook in all problem types is well known, of course. Its easiest to express in some problem types like seriesmovers.

I wonder if there has ever been a four corner promoted rook in a directmate? - I know the queen has featured in this way, in a Russian problem from a semi-open Kegel, and probably others. With a friend of mine, I've composed an (as-of-yet unfinished) directmate #6 with a Phoenix 4 corner rook. We'd like to know what has been done before we decide what to do with the idea...... I've seen a few four corner rooks in directmates in recent magazines (all with the rook already on the board), most recently Probleemblad, so the idea is perhaps not exhausted.

It's not a directmate, but here's a nice four corner promoted rook in a helpmate.

P0500730
Bo Lindgren, 8944 Tidskrift för Schack 07/1945, 2nd prize 7th theme tournament of the Stockholm problem chess club
h#5

(= 2+15 )

P.S.-10 years is a long while for a reply, ey? :-)

what is the stipulation? and solution pl

h#4 1.Ba1 h8R+ 2.Kg7 R:a8 3.Rd7 R:a1 4.Kf8 Rh1 5.Ke8 Rh8 mate

Easy to find.

And nice solving Siegfried!

I found only three corners in a moremover:
http://pdb.dieschwalbe.de/search.jsp?expression=probid=%27P1243083%27or%20probid=%27P1248204%27

I don't get it completely. I tried mirroring etc, but if I move the white king away to enforce taking on h8 also, I can't protect g2 properly (a knight would either defend h3 also, block the first rank or give check - a bishop would add other solutions).

(= 5+2 )

SH, original
Mate in 3.5
(threat 2.Rh1 and 3.Bh2 mate)
1.-K:g1 2.R:a8 Kh2 3.Ra1 Kh3 4.Rh1 mate
(1.-Ke1 2.R:a8 Kd1 3.Rc8 Ke1 4.Rc1 mate)

The best I got is this ugly setting: (wRh8->h2, +bRh8, Mate in 4)
If the white rook would start on h1 instead of h2, I would be glad even with the two forced captures.

EDIT: Here is the perfect setting. Sadly, as Olaf says below, I misunderstood the theme and didn't see it should be a promoted rook.

(= 3+2 )

SH, Original
Mate in 4
1.Ra8 K:h7 2.R:a1 Kg8 3.Rh1 Kf8 4.Rh8 mate (1.-Kh5? 2.Rg8)
This is so simple it is likely completely anticipated

Steven asked for a promoted rook.

I recall that I read the initial post in the "good old days" and rolled up my sleeves:

Joaquim Crusats
Mirko Degenkolbe
Steven B. Dowd
Die Schwalbe 2008
(= 12+7 )

#8

7B/4p2P/3pp2q/4p2P/4P1P1/2PKRP1p/1PN1N3/3k4

Try: The move 1.Bxe5?, an immediate active sacrifice of the white bishop, is refuted not by 1...Qxe3+ (or any other move!), but rather 1…h2! If 1.Bxe5 Qxe3+? 2.Sxe3+ Ke1 3.Bg3#, and 1…dxe5? simply would lead back to 2.c4!

Key: 1.c4! (thr. 2.Sc3+ Kc1 3.Re1+ Kxb2 4.Rb1#) Qxe3+ 2.S×e3+ Ke1 3.Bxe5 dxe5 4.h8=R (4.h8=Q? h2 5.Qxe5 h1=S!) Kf2 5.Ra8 h2 6.Ra1 h1=Q/R 7.Rxh1 Kxf3 8.Rf1# 4...h2 5.Ra8 h1=Q/R 6.Ra1+ Kf2 7.Rxh1 Kxf3 8.Rf1 5...Kf2 6.Ra1 h1=Q/R 7.Kxf3 8.Rf1#

Phoenix, underpromotion, stalemate avoidance, echo motif between threat and solution, first example of a promoted four-corner-rook, clearance.

It's in the PDB: P1255788.
I didn't find it because the solution was given only in the comment section.

The #8 is very good. But in my opinion, the promoted rook only visits three corners.

@Siegfried, you are correct that your 5 piece #4 is completely anticipated. See here: https://www.yacpdb.org/#64590

Shinkman found it first in 1901.