MESON Chess Problem Database

Problem Display
PID: 78601 (1b6/8/K7/8/8/7p/R7/5Qnk w - - 0 1)

Backe, Odd Erik

Leninska molodi, 1967

1b6/8/K7/8/8/7p/R7/5Qnk

#2

3 + 4

5454 Near Snap 2008

SOLUTION

  • SOUND
  • Sets
    • 1...h2
      • 2.Qg2#
  • Tries
    • 1.Qxh3+?
      • 1...Bh2
        • 2.Rxh2#
        • 2.Qg2#
        • 2.Qxh2#
      • 1...Sxh3!
  • Keys
    • 1.Ra1!
      • threat
        • 2.Qxg1#
      • 1...Kh2
        • 2.Qxg1#
      • 1...Bh2
        • 2.Qf3#
      • 1...Ba7
        • 2.Qxh3#
      • 1...h2
        • 2.Qf3#

Anticipated by 121513(1947)

This anticipates 29055(1980), 200425(1999)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(c);N_GUARD::QAB1(A)
  • Tries
    • Try
      • Q(A);CHECK,N_PINS(a),XP(c)
      • Refutation
        • S(a);XQ(A)
  • Actual
    • R(B);
    • Threat
      • QAR1(A),XS(a)
    • Vars
      • K(b);N_SPINS(a),P-FLIGHT::QAB1(A),XS(a)
      • B(d);SBLOCK::QAB(A)
      • B(d);N_GUARD::QAR2(A),XP(c)
      • P(c);SBLOCK::QAB(A)
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