MESON Chess Problem Database

Problem Display
PID: 4716 (8/8/3Q4/6N1/3p4/4k3/8/4K2n w - - 0 1)

Hertzsprung, Severin Carl Ludvig

Nationaltidende, 1888

8/8/3Q4/6N1/3p4/4k3/8/4K2n

#2

3 + 3

5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Qg3#
    • 1...Sg3
      • 2.Qxg3#
    • 1...d3
      • 2.Qe5#
  • Tries
    • 1.Qh2?
      • threat
        • 2.Qd2#
      • 1...Sf2
        • 2.Qg3#
      • 1...d3
        • 2.Qe5#
      • 1...Kd3!
    • 1.Qb4?
      • threat
        • 2.Qd2#
      • 1...Kd3
        • 2.Qb3#
      • 1...d3
        • 2.Qe4#
      • 1...Kf4!
    • 1.Qc7?
      • 1...Sf2
        • 2.Qg3#
      • 1...Sg3
        • 2.Qxg3#
      • 1...d3
        • 2.Qe5#
      • 1...Kd3!
    • 1.Qd5?
      • threat
        • 2.Qf3#
        • 2.Qe4#
      • 1...Kd3
        • 2.Qb3#
      • 1...d3
        • 2.Qe4#
        • 2.Qe5#
      • 1...Sf2
        • 2.Qf3#
      • 1...Sg3
        • 2.Qf3#
      • 1...Kf4!
    • 1.Qe6+?
      • 1...Kd3
        • 2.Qb3#
      • 1...Kf4!
    • 1.Qf6?
      • threat
        • 2.Qf3#
      • 1...d3
        • 2.Qe5#
      • 1...Kd3!
  • Keys
    • 1.Qb8!
      • 1...Kd3
        • 2.Qb3#
      • 1...Sf2
        • 2.Qg3#
      • 1...Sg3
        • 2.Qxg3#
      • 1...d3
        • 2.Qe5#

This anticipates 184738(1908)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR2(C)
    • S(a);N_GUARD::QAR2(C),XS(a)
    • P(c);SBLOCK::QAR2(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • S(a);N_GUARD::QAR2(C)
        • P(c);SBLOCK::QAR2(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(b);P-FLIGHT::QAR2(C)
        • P(c);OGATE::QAR1(C)
      • Refutation
        • K(b);P_SPINP(c),S_FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(a);N_GUARD::QAR2(C)
        • S(a);N_GUARD::QAR2(C),XS(a)
        • P(c);SBLOCK::QAR2(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT,P_SPINP(c)::QAR2(C)
        • S(a);::QAR1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • P(c);SBLOCK::QAR2(C)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(C);
    • Vars
      • K(b);P-FLIGHT::QAR2(C)
      • S(a);N_GUARD::QAR2(C)
      • S(a);N_GUARD::QAR2(C),XS(a)
      • P(c);SBLOCK::QAR2(C)
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