MESON Chess Problem Database

Problem Display
PID: 77321 (K7/8/8/8/4N3/5N2/R5n1/5k1n w - - 0 1)

Civis Bonaniae

Source?, 1300

K7/8/8/8/4N3/5N2/R5n1/5k1n

#2

4 + 3

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Sg3#
      • 2.Rxf2#
    • 1...Sg3
      • 2.Sxg3#
      • 2.Rf2#
  • Tries
    • 1.Rxg2?
      • 1...Sf2
        • 2.Rxf2#
      • 1...Sg3
        • 2.Rf2#
      • 1...Kxg2!
  • Keys
    • 1.Rf2+!
      • 1...Sxf2
        • 2.Sg3#

This anticipates 231593(1927)

This is a version of 29184

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(A);XS(c)
      • Vars
        • S(b);N_GUARD::R1(A),XS(b)
        • S(b);N_GUARD::R1(A)
      • Refutation
        • K(a);S_FLIGHT,XR(A)
  • Actual
    • R(A);CHECK
    • Vars
      • S(b);SBLOCK,XR(A)::S(C)
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