MESON Chess Problem Database

Problem Display
PID: 178096 (8/8/8/8/8/r1R4Q/b7/k1K5 w - - 0 1)

Godal, Ivar

Postsjakk, 1965

8/8/8/8/8/r1R4Q/b7/k1K5

#2

3 + 3

5454 Near Snap 2018
3713 Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc3+
      • 2.Qxc3#
  • Keys
    • 1.Qh8!
      • threat
        • 2.Rxa3#
        • 2.Rb3#
      • 1...Rxc3+
        • 2.Qxc3#
      • 1...Bb1
        • 2.Rxa3#
      • 1...Bb3
        • 2.Rc2#
      • 1...Bc4
        • 2.Rxa3#
      • 1...Bd5
        • 2.Rxa3#
      • 1...Be6
        • 2.Rxa3#
      • 1...Bf7
        • 2.Rxa3#
      • 1...Bg8
        • 2.Rxa3#
      • 1...Rb3
        • 2.Rxb3#
      • 1...Ra4
        • 2.Rc4#
      • 1...Ra5
        • 2.Rc5#
      • 1...Ra6
        • 2.Rc6#
      • 1...Ra7
        • 2.Rc7#
      • 1...Ra8
        • 2.Rc8#

Anticipated by 184801(1908), 195059(1918)

This anticipates 172205(1983)

This is a version of 157484

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 13
    • REMOVED MATES = 0
  • Sets
    • R(c);CHECK,OGATE,XR(B)::QAB(C),XR(c)
  • Actual
    • Q(C);
    • Threat
      • DUALS(2)
    • Vars
      • R(c);CHECK,OGATE,P_SPINR(c),XR(B)::QAB(C),XR(c)
      • B(b);::QAB(C)+R(B),DCHECK,XR(c)
      • B(b);S_CUTR(c)::QAB(C)+R(B)
      • R(c);::QAB(C)+R(B),XR(c)
      • R(c);N_GUARD::QAB(C)+R(B)
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