MESON Chess Problem Database

Problem Display
PID: 194910 (1n3rnK/4k1PR/7p/2N1bP1B/7p/8/3Q4/4R3 w - - 0 1)

Guidelli, Giorgio

L'Italia Scacchistica, 1918

1n3rnK/4k1PR/7p/2N1bP1B/7p/8/3Q4/4R3

#2

8 + 7

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.gxf8Q#
      • 2.gxf8R#
    • 1...Sf6+
      • 2.g8S#
  • Tries
    • 1.Qd7+?
      • 1...Kf6
        • 2.Se4#
      • 1...Sxd7!
    • 1.f6+?
      • 1...Kxf6
        • 2.gxf8Q#
        • 2.gxf8R#
      • 1...Sxf6+
        • 2.g8S#
      • 1...Rxf6!
  • Keys
    • 1.Sb7!
      • threat
        • 2.Qd6#
      • 1...Sf6+
        • 2.g8S#
      • 1...Kf6
        • 2.gxf8Q#
        • 2.gxf8R#
      • 1...Rf7
        • 2.Qd8#
      • 1...Rf6
        • 2.Qd8#
      • 1...Rd8
        • 2.Qxd8#

This is a version of 194911

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(d);N_PINP(F),N_SPINB(b),S_FLIGHT::PXR(f)=Q
    • S(g);CHECK,N_PINP(F)::P=S
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);N_PINP(F),N_SPINB(b),S_FLIGHT::S(C)
      • Refutation
        • S(e);XQ(B)
    • Try
      • P(D);CHECK,N_SPINP(F)
      • Vars
        • K(d);N_SPINB(b),S_FLIGHT,XP(D)::PXR(f)=Q
        • S(g);CHECK,OGATE,XP(D)::P=S
      • Refutation
        • R(f);XP(D)
  • Actual
    • S(C);
    • Threat
      • QAB1(B)
    • Vars
      • S(g);CHECK,N_PINP(F)::P=S
      • K(d);N_PINP(F),N_SPINB(b),S_FLIGHT::PXR(f)=Q
      • R(f);N_GUARD::QAB1(B)
      • R(f);N_GUARD,N_PINP(F),SBLOCK::QAB1(B)
      • R(f);N_GUARD::QAB1(B),XR(f)
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