MESON Chess Problem Database

Problem Display
PID: 212395 (k7/1r1N4/8/8/8/6p1/6Q1/K7 w - - 0 1)

Hultberg, Gustav Herbert

Land og Folk, 1976

k7/1r1N4/8/8/8/6p1/6Q1/K7

#2

3 + 3

15148 Sadier Collection 2020
5454 Near Snap 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Ka7
      • 2.Qa2#
  • Tries
    • 1.Qf3?
      • 1...Ka7
        • 2.Qa3#
      • 1...g2!
    • 1.Qe4?
      • 1...Ka7
        • 2.Qa4#
      • 1...g2!
    • 1.Qd5?
      • 1...Ka7
        • 2.Qa2#
        • 2.Qa5#
      • 1...g2!
    • 1.Qc6?
      • 1...Ka7
        • 2.Qa4#
      • 1...g2!
  • Keys
    • 1.Sc5!
      • threat
        • 2.Qxb7#
      • 1...Ka7
        • 2.Qxb7#
      • 1...Kb8
        • 2.Qxb7#

Anticipated by 206720(1925)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(c);N_SPINR(b),P-FLIGHT::QAR(B)
  • Tries
    • Try
      • Q(B);
      • Vars
        • K(c);N_SPINR(b),P-FLIGHT::QAR(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);
      • Vars
        • K(c);N_SPINR(b),P-FLIGHT::QAR(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);
      • Refutation
        • P(a);
    • Try
      • Q(B);
      • Vars
        • K(c);N_SPINR(b),P-FLIGHT::QAR(B)
      • Refutation
        • P(a);
  • Actual
    • S(C);
    • Threat
      • QAB1(B),XR(b)
    • Vars
      • K(c);N_SPINR(b),P-FLIGHT::QAR1(B),XR(b)
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