MESON Chess Problem Database

Problem Display
PID: 92295 (8/8/8/p6p/K6Q/P2k1p2/5p2/1NB2R2 w - - 0 1)

Hermanson, Halvar

Schach-Echo, 1958

8/8/8/p6p/K6Q/P2k1p2/5p2/1NB2R2

#2

6 + 5

5454 Near Snap 2009
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kc2
      • 2.Qe4#
    • 1...Ke2
      • 2.Qc4#
  • Tries
    • 1.Kb3?
      • threat
        • 2.Qc4#
      • 1...Ke2
        • 2.Qc4#
      • 1...a4+!
    • 1.Kxa5?
      • 1...Ke2
        • 2.Qc4#
      • 1...Kc2!
    • 1.Kb5?
      • threat
        • 2.Qc4#
      • 1...Ke2
        • 2.Qc4#
      • 1...Kc2!
    • 1.Bd2?
      • 1...Ke2
        • 2.Qc4#
      • 1...Kc2!
    • 1.Bg5?
      • 1...Ke2
        • 2.Qc4#
      • 1...Kc2!
    • 1.Bh6?
      • 1...Ke2
        • 2.Qc4#
      • 1...Kc2!
    • 1.Rd1+?
      • 1...Ke2
        • 2.Sc3#
      • 1...Kc2!
    • 1.Qd4+?
      • 1...Kc2
        • 2.Qe4#
      • 1...Ke2
        • 2.Qd1#
        • 2.Qc4#
      • 1...Kxd4!
    • 1.Qf4?
      • 1...Kc2
        • 2.Qe4#
        • 2.Qf5#
      • 1...Ke2
        • 2.Qc4#
      • 1...h4!
  • Keys
    • 1.Sd2!
      • 1...Kc2
        • 2.Qc4#
      • 1...Ke2
        • 2.Qe4#
      • 1...Kc3
        • 2.Qc4#
      • 1...Ke3
        • 2.Qe4#

Anticipated by 16715(1942), 93933(1956)

This anticipates 9835(1960), 219864(1979)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAB(F)
  • Tries
    • Try
      • K(E);S_FLIGHT
      • Threat
        • QAB1(F)
      • Vars
        • K(b);S_FLIGHT::QAB(F)
      • Refutation
        • P(d);CHECK
    • Try
      • K(E);P-FLIGHT,XP(d)
      • Vars
        • K(b);S_FLIGHT::QAB(F)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • K(E);S_FLIGHT
      • Threat
        • QAB1(F)
      • Vars
        • K(b);S_FLIGHT::QAB(F)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • B(B);
      • Vars
        • K(b);S_FLIGHT::QAB(F)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • B(B);
      • Vars
        • K(b);S_FLIGHT::QAB(F)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • B(B);
      • Vars
        • K(b);S_FLIGHT::QAB(F)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(C);CHECK
      • Vars
        • K(b);S_FLIGHT::S(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB(F)
      • Refutation
        • K(b);P-FLIGHT,XQ(F)
    • Try
      • Q(F);
      • Vars
        • K(b);S_FLIGHT::QAB(F)
      • Refutation
        • P(e);
  • Actual
    • S(A);
    • Vars
      • K(b);S_FLIGHT::QAR2(F)
      • K(b);P-FLIGHT::QAR1(F)
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