MESON Chess Problem Database

Problem Display
PID: 203637 (8/8/8/8/n1QK4/8/pk6/2Rb4 w - - 0 1)

Henke, Walter

Arbeiter Schachzeitung, 1924

8/8/8/8/n1QK4/8/pk6/2Rb4

#2

3 + 4

5454 Near Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sc3
      • 2.Qxc3#
    • 1...Sc5
      • 2.Qc3#
    • 1...Sb6
      • 2.Qc3#
  • Tries
    • 1.Rc2+?
      • 1...Ka1
        • 2.Qxa2#
      • 1...Kb1
        • 2.Qxa2#
      • 1...Ka3
        • 2.Rxa2#
      • 1...Bxc2!
  • Keys
    • 1.Ra1!
      • threat
        • 2.Qxa2#
      • 1...Kxa1
        • 2.Qc1#
      • 1...Ka3
        • 2.Rxa2#
      • 1...Sc3
        • 2.Qxc3#
      • 1...Bb3
        • 2.Qc1#

This anticipates 47742(1991)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(d);N_GUARD::QAB1(B),XS(d)
    • S(d);N_GUARD::QAB1(B)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR1(B),XP(b)
        • K(c);P-FLIGHT::QAB1(B),XP(b)
        • K(c);OGATE,S_FLIGHT::R1(A),XP(b)
      • Refutation
        • B(a);XR(A)
  • Actual
    • R(A);
    • Threat
      • QAR1(B),XP(b)
    • Vars
      • K(c);S_FLIGHT,XR(A)::QAR2(B)
      • K(c);P_SPINP(b),S_FLIGHT::R1(A),XP(b)
      • S(d);N_GUARD::QAB1(B),XS(d)
      • B(a);SBLOCK::QAB1(B)
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