MESON Chess Problem Database

Problem Display
PID: 243830 (2B5/8/1B3K2/7b/6pk/4Q3/8/8 w - - 0 1)

Chepizhni, Viktor Ivanovich

Smena, 1990

2B5/8/1B3K2/7b/6pk/4Q3/8/8

#2

4 + 3

15148 Sadier Collection 2021
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...g3
      • 2.Qg5#
  • Tries
    • 1.Qg1?
      • threat
        • 2.Qh2#
      • 1...g3
        • 2.Qh1#
      • 1...Kh3!
    • 1.Qe1+?
      • 1...g3
        • 2.Qh1#
      • 1...Kh3!
    • 1.Qh3+?
      • 1...gxh3
        • 2.Bf2#
      • 1...Kxh3!
    • 1.Qe5?
      • threat
        • 2.Qh2#
      • 1...g3
        • 2.Qg5#
      • 1...Kh3!
  • Keys
    • 1.Qf3!
      • 1...gxf3
        • 2.Bf2#
      • 1...Bg6
        • 2.Qxg4#
      • 1...Bf7
        • 2.Qxg4#
      • 1...Be8
        • 2.Qxg4#
      • 1...g3
        • 2.Qh1#

This anticipates 215538(2001)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(a);::QAB1(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • P(a);SBLOCK::QAR(A)
      • Refutation
        • K(b);P-FLIGHT,P_SPINP(a)
    • Try
      • Q(A);CHECK
      • Vars
        • P(a);P_SPINP(a),SBLOCK::QAR(A)
      • Refutation
        • K(b);P-FLIGHT,P_SPINP(a)
    • Try
      • Q(A);CHECK
      • Vars
        • P(a);XQ(A)::B(B)
      • Refutation
        • K(b);P-FLIGHT,P_SPINP(a),XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • P(a);::QAB1(A)
      • Refutation
        • K(b);P-FLIGHT,P_SPINP(a)
  • Actual
    • Q(A);
    • Vars
      • P(a);N_GUARD,XQ(A)::B(B)
      • B(c);N_GUARD::QAR1(A),XP(a)
      • P(a);SBLOCK::QAR(A)
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