MESON Chess Problem Database

Problem Display
PID: 71073 (r7/1Rp2k2/3Q4/4p2N/p6K/8/8/8 w - - 0 1)

Zarur, Almiro Elias

Comm., Probleemblad 114. TT, 1964

r7/1Rp2k2/3Q4/4p2N/p6K/8/8/8

#2

4 + 5

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Rxc7+?
      • 1...Ke8
        • 2.Sf6#
        • 2.Sg7#
        • 2.Qe7#
      • 1...Kg8!
    • 1.Qf6+?
      • 1...Kg8
        • 2.Qg7#
      • 1...Ke8!
  • Keys
    • 1.Qxc7+!
      • 1...Ke6
        • 2.Qd7#
      • 1...Kg6
        • 2.Qh7#
      • 1...Ke8
        • 2.Qe7#
      • 1...Kf8
        • 2.Qf7#
      • 1...Kg8
        • 2.Qg7#

This anticipates 227934(1988)

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(D);CHECK,XP(c)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);N_SPINP(c),S_FLIGHT::QAR1(C)
      • Refutation
        • K(d);N_SPINP(c),S_FLIGHT
  • Actual
    • Q(C);CHECK,XP(c)
    • Vars
      • K(d);S_FLIGHT::QAB1(C)
      • K(d);OGATE,S_FLIGHT::QAB1(C)
      • K(d);S_FLIGHT::QAR1(C)
      • K(d);P-FLIGHT::QAR1(C)
      • K(d);OGATE,S_FLIGHT::QAR1(C)
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