MESON Chess Problem Database

Problem Display
PID: 239837 (4R3/6p1/5p2/2p2k1p/8/7K/4N3/6Q1 w - - 0 1)

Hermanson, Halvar

Themes-64, 1962

4R3/6p1/5p2/2p2k1p/8/7K/4N3/6Q1

#2

4 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...h4
      • 2.Qg4#
    • 1...g5
      • 2.Qb1#
    • 1...g6
      • 2.Qxc5#
  • Tries
    • 1.Sd4+?
      • 1...Kf4
        • 2.Qe3#
        • 2.Qc1#
        • 2.Qg3#
      • 1...cxd4!
    • 1.Re7?
      • 1...g5
        • 2.Qb1#
      • 1...h4
        • 2.Qg4#
      • 1...g6
        • 2.Qxc5#
      • 1...c4!
    • 1.Qg2?
      • 1...g5
        • 2.Qe4#
      • 1...h4
        • 2.Qg4#
      • 1...g6
        • 2.Qd5#
      • 1...c4!
    • 1.Qxg7?
      • 1...h4
        • 2.Qg4#
      • 1...c4!
  • Keys
    • 1.Qg3!
      • 1...g5
        • 2.Qd3#
      • 1...c4
        • 2.Sd4#
      • 1...h4
        • 2.Qg4#
      • 1...g6
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(c);N_GUARD::QAB1(A)
    • P(e);SBLOCK::QAB(A)
    • P(e);SBLOCK::QAR(A),XP(a)
  • Tries
    • Try
      • S(B);CHECK
      • Refutation
        • P(a);XS(B)
    • Try
      • R(D);
      • Vars
        • P(e);SBLOCK::QAB(A)
        • P(c);N_GUARD::QAB1(A)
        • P(e);SBLOCK::QAR(A),XP(a)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Vars
        • P(e);SBLOCK::QAB1(A)
        • P(c);N_GUARD::QAB1(A)
        • P(e);SBLOCK::QAR2(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);XP(e)
      • Vars
        • P(c);N_GUARD::QAB1(A)
      • Refutation
        • P(a);
  • Actual
    • Q(A);
    • Vars
      • P(e);SBLOCK::QAB(A)
      • P(a);N_GUARD::S(B)
      • P(c);N_GUARD::QAB1(A)
      • P(e);SBLOCK::QAR1(A)
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