MESON Chess Problem Database

Problem Display
PID: 176185 (8/1Q6/6p1/8/8/K1pp4/2k5/1R6 w - - 0 1)

Betzen, Wolfgang

Schach-Echo, 1967

8/1Q6/6p1/8/8/K1pp4/2k5/1R6

#2

3 + 4

5454 Near Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...d2
      • 2.Qe4#
  • Tries
    • 1.Rd1?
      • threat
        • 2.Qb1#
        • 2.Qb3#
      • 1...d2
        • 2.Qb1#
      • 1...Kxd1!
    • 1.Rb2+?
      • 1...Kc1
        • 2.Qh1#
      • 1...Kd1
        • 2.Qh1#
      • 1...cxb2!
    • 1.Qh1?
      • threat
        • 2.Qc1#
        • 2.Qd1#
      • 1...d2
        • 2.Qe4#
      • 1...Kd2!
    • 1.Qg2+?
      • 1...d2
        • 2.Qe4#
        • 2.Qxg6#
      • 1...Kxb1!
    • 1.Qb6?
      • 1...Kd2
        • 2.Qf2#
      • 1...d2
        • 2.Qxg6#
      • 1...g5!
    • 1.Qf7?
      • threat
        • 2.Qa2#
      • 1...Kd2
        • 2.Qf2#
      • 1...d2
        • 2.Qxg6#
      • 1...Kxb1!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Qd1#
      • 1...Kxb1
        • 2.Qd1#
      • 1...Kd2
        • 2.Qf2#
      • 1...d2
        • 2.Qe4#

Anticipated by 230761(1967)

This anticipates 199779(2013), 160329(2016)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATEB,SBLOCK::QAB(C)
  • Tries
    • Try
      • R(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);::QAB1(C)
      • Refutation
        • K(a);S_FLIGHT,XR(A)
    • Try
      • R(A);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR(C)
        • K(a);S_FLIGHT::QAR(C)
      • Refutation
        • P(b);XR(A)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Refutation
        • K(a);S_FLIGHT,XR(A)
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
        • P(c);OGATEB,SBLOCK::QAB(C),XP(d)
      • Refutation
        • P(d);
    • Try
      • Q(C);
      • Threat
        • QAR2(C)
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
        • P(c);OGATEB,SBLOCK::QAB(C),XP(d)
      • Refutation
        • K(a);S_FLIGHT,XR(A)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • K(a);S_FLIGHT,XR(A)::QAR2(C)
      • K(a);P-FLIGHT::QAR2(C)
      • P(c);OGATEB,SBLOCK::QAB(C)
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