MESON Chess Problem Database

Problem Display
PID: 149606 (8/8/8/2K2Q2/k7/1p6/8/8 w - - 0 1)

Dehler, Ernst Georg

Source?, 1906

8/8/8/2K2Q2/k7/1p6/8/8

#2

2 + 2

15148 Sadier Collection 2014
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Tries
    • 1.Qe4+?
      • 1...Ka5
        • 2.Qa8#
      • 1...Ka3!
    • 1.Qd7+?
      • 1...Ka5
        • 2.Qb5#
        • 2.Qa7#
      • 1...Ka3!
    • 1.Qf1?
      • threat
        • 2.Qa6#
        • 2.Qa1#
      • 1...Ka3
        • 2.Qa1#
      • 1...Ka5
        • 2.Qb5#
        • 2.Qa1#
      • 1...b2!
    • 1.Qd5?
      • threat
        • 2.Qa8#
      • 1...Ka5
        • 2.Qa8#
      • 1...b2
        • 2.Qa2#
      • 1...Ka3!
    • 1.Qe5?
      • threat
        • 2.Qa1#
      • 1...Ka3
        • 2.Qa1#
      • 1...Ka5
        • 2.Qa1#
      • 1...b2!
    • 1.Qf6?
      • threat
        • 2.Qa1#
        • 2.Qa6#
      • 1...Ka3
        • 2.Qa1#
      • 1...Ka5
        • 2.Qa1#
      • 1...b2!
    • 1.Qf7?
      • threat
        • 2.Qa7#
      • 1...Ka5
        • 2.Qa7#
      • 1...b2
        • 2.Qa2#
      • 1...Ka3!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Qa1#
      • 1...Ka3
        • 2.Qa1#
      • 1...Ka5
        • 2.Qa1#
      • 1...b2
        • 2.Qa2#

This anticipates 121473(1977)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR(B)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);
      • Threat
        • QAR(B)
      • Vars
        • K(b);P-FLIGHT::QAR(B)
        • P(a);OGATE::QAR2(B)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAR(B)
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
        • K(b);P-FLIGHT::QAR(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
        • K(b);P-FLIGHT::QAR(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);
      • Threat
        • QAR(B)
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
        • P(a);OGATE::QAR2(B)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • K(b);P-FLIGHT::QAR2(B)
      • K(b);P-FLIGHT::QAR(B)
      • P(a);N_GUARD::QAR2(B)
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