MESON Chess Problem Database

Problem Display
PID: 178142 (8/8/5Q2/8/8/6p1/6pN/3K2k1 w - - 0 1)

Petkov, Petko Andonov

Schach-Echo, 1959

8/8/5Q2/8/8/6p1/6pN/3K2k1

#2

3 + 3

5454 Near Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Qh8?
      • 1...Kh1
        • 2.Sf3#
      • 1...Kf2
        • 2.Qd4#
      • 1...gxh2!
    • 1.Qh6?
      • 1...Kh1
        • 2.Sf3#
      • 1...Kf2
        • 2.Qb6#
      • 1...gxh2!
  • Keys
    • 1.Qh4!
      • 1...Kh1
        • 2.Sf3#
      • 1...Kf2
        • 2.Qd4#
      • 1...gxh2
        • 2.Qe1#

Anticipated by 9316(1876), 208783(1876), 248226(1880), 182373(1906), 80835(1928)

This anticipates 79327(1960), 67025(2001), 164584(2007)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT::QAR(C)+S(B)
        • K(a);S_FLIGHT::QAB(C)
      • Refutation
        • P(c);XS(B)
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT::QAR(C)+S(B)
        • K(a);S_FLIGHT::QAB(C)
      • Refutation
        • P(c);XS(B)
  • Actual
    • Q(C);
    • Vars
      • K(a);P-FLIGHT::QAR(C)+S(B)
      • K(a);P_SPINP(c),S_FLIGHT::QAB(C)
      • P(c);OGATE,SBLOCK,XS(B)::QAR2(C)
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