MESON Chess Problem Database

Problem Display
PID: 218796 (8/2PpPk2/5p1K/8/6Q1/8/8/8 w - - 0 1)

Schafer, Peter

Deutsche Schachzeitung, 1986

8/2PpPk2/5p1K/8/6Q1/8/8/8

#2

4 + 3

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Qxd7?
      • threat
        • 2.e8Q#
        • 2.e8R#
      • 1...Kg8
        • 2.Qe8#
        • 2.e8Q#
        • 2.e8R#
      • 1...f5!
    • 1.Qg7+?
      • 1...Ke8
        • 2.Qf8#
        • 2.c8Q#
        • 2.c8R#
      • 1...Ke6!
    • 1.c8Q?
      • threat
        • 2.Qf8#
        • 2.e8Q#
      • 1...Kxe7
        • 2.Qgxd7#
      • 1...f5!
    • 1.e8R?
      • threat
        • 2.Qh5#
        • 2.Qxd7#
        • 2.Qg6#
        • 2.Qg8#
      • 1...f5
        • 2.Qg6#
      • 1...d5
        • 2.Qh5#
        • 2.Qe6#
        • 2.Qd7#
        • 2.Qg6#
        • 2.Qg8#
      • 1...d6
        • 2.Qh5#
        • 2.Qe6#
        • 2.Qd7#
        • 2.Qg6#
        • 2.Qg8#
      • 1...Kxe8!
  • Keys
    • 1.Qg8+!
      • 1...Kxe7
        • 2.c8S#
      • 1...Kxg8
        • 2.e8Q#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);XP(b)
      • Threat
        • P=Q
      • Refutation
        • P(a);
    • Try
      • Q(A);CHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • P(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(D)::QAR1(A),XP(b)
      • Refutation
        • P(a);
    • Try
      • P(D);
      • Threat
        • DUALS(4)
      • Vars
        • P(a);::QAB1(A)
      • Refutation
        • K(c);S_FLIGHT,XR(D)
  • Actual
    • Q(A);CHECK
    • Vars
      • K(c);P-FLIGHT,XP(D)::P=S
      • K(c);S_FLIGHT,XQ(A)::P=Q
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