MESON Chess Problem Database

Problem Display
PID: 169983 (R7/8/4K3/6p1/7p/4P2k/5Q2/8 w - - 0 1)

Lincoln, Robert A

3rd HM., Problemist Ukraini 16. TT, 2016

R7/8/4K3/6p1/7p/4P2k/5Q2/8

#2

4 + 3

145 StrateGems 2017
145 StrateGems 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Ra1?
      • 1...g4
        • 2.Rh1#
      • 1...Kg4!
    • 1.Ra2?
      • threat
        • 2.Qg2#
        • 2.Qf3#
      • 1...g4
        • 2.Qg2#
        • 2.Qh2#
      • 1...Kg4!
    • 1.Rf8?
      • 1...Kg4
        • 2.Qf3#
      • 1...g4!
  • Keys
    • 1.Rh8!
      • 1...Kg4
        • 2.Qg2#
      • 1...g4
        • 2.Rxh4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(D);
      • Vars
        • P(c);SBLOCK::R(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(D);
      • Threat
        • DUALS(2)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(D);
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
      • Refutation
        • P(c);
  • Actual
    • R(D);P_PINP(b)
    • Vars
      • K(a);N_SPINP(b),S_FLIGHT::QAR2(A)
      • P(c);N_GUARD::R1(D),XP(b)
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