MESON Chess Problem Database

Problem Display
PID: 231221 (2k5/2P3n1/2rP2K1/B1N5/2N5/8/8/Q7 w - - 0 1)

Restad, Birger

Schackvarlden, 1927

2k5/2P3n1/2rP2K1/B1N5/2N5/8/8/Q7

#2

7 + 3

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rb6
      • 2.Sxb6#
    • 1...Rxd6+
      • 2.Sxd6#
    • 1...Sf5
      • 2.Qh8#
    • 1...Sh5
      • 2.Qh8#
    • 1...Se6
      • 2.d7#
  • Tries
    • 1.Bb6?
      • threat
        • 2.Qa6#
        • 2.Qa8#
      • 1...Rxd6+
        • 2.Sxd6#
      • 1...Rxb6
        • 2.Sxb6#
      • 1...Rxc7
        • 2.Qa8#
      • 1...Rxc5!
    • 1.Qxg7?
      • threat
        • 2.Qf8#
        • 2.Qh8#
        • 2.Qd7#
        • 2.Qg8#
      • 1...Rxd6+
        • 2.Sxd6#
      • 1...Rxc7
        • 2.Qf8#
        • 2.Qh8#
        • 2.Qxc7#
        • 2.Qg8#
      • 1...Rxc5!
  • Keys
    • 1.Qh1!
      • 1...Rxd6+
        • 2.Sxd6#
      • 1...Rxc5
        • 2.Sb6#
      • 1...Rxc7
        • 2.Qa8#
      • 1...Ra6
        • 2.Qb7#
      • 1...Rb6
        • 2.Sxb6#
      • 1...Sf5
        • 2.Qh8#
      • 1...Sh5
        • 2.Qh3#
      • 1...Se6
        • 2.d7#
      • 1...Se8
        • 2.Qh3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(a);N_GUARD::S(B),XR(a)
    • R(a);CHECK,XP(E)::S(B),XR(a)
    • S(b);OGATE::QAR(A)
    • S(b);N_PINP(E)::P(E)
  • Tries
    • Try
      • B(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);CHECK,XP(E)::S(B),XR(a)
        • R(a);XB(C)::S(B),XR(a)
        • R(a);N_PINP(E),XP(G)::QAR2(A)
      • Refutation
        • R(a);N_PINP(E),XS(D)
    • Try
      • Q(A);XS(b)
      • Threat
        • DUALS(4)
      • Vars
        • R(a);CHECK,XP(E)::S(B),XR(a)
      • Refutation
        • R(a);N_PINP(E),XS(D)
  • Actual
    • Q(A);
    • Vars
      • R(a);CHECK,XP(E)::S(B),XR(a)
      • R(a);N_GUARD,N_PINP(E),XS(D)::S(B)
      • R(a);N_PINP(E),OGATE,XP(G)::QAR2(A)
      • R(a);OGATE::QAB1(A)
      • R(a);N_GUARD::S(B),XR(a)
      • S(b);N_GUARD::QAR(A)
      • S(b);N_GUARD::QAB(A)
      • S(b);N_PINP(E)::P(E)
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Developed and maintained by Brian Stephenson.
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