MESON Chess Problem Database

Problem Display
PID: 180528 (r7/1Q6/2p5/k2n3R/8/1K6/8/8 w - - 0 1)

Lider, Valentin Viktorovich

Northwest Chess, 1972

r7/1Q6/2p5/k2n3R/8/1K6/8/8

#2

3 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra6
      • 2.Qb4#
  • Tries
    • 1.Rxd5+?
      • 1...c5
        • 2.Rxc5#
      • 1...cxd5!
  • Keys
    • 1.Kc4!
      • 1...Ka4
        • 2.Qxa8#
      • 1...Ra6
        • 2.Qb4#
      • 1...Ra7
        • 2.Qxa7#
      • 1...Rb8
        • 2.Qa7#
      • 1...Rc8
        • 2.Qa7#
      • 1...Rd8
        • 2.Qa7#
      • 1...Re8
        • 2.Qa7#
      • 1...Rf8
        • 2.Qa7#
      • 1...Rg8
        • 2.Qa7#
      • 1...Rh8
        • 2.Qa7#
      • 1...c5
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • R(d);SBLOCK::QAB1(C)
  • Tries
    • Try
      • R(B);CHECK,XS(b)
      • Vars
        • P(c);P_SPINP(c)::R(B),XP(c)
      • Refutation
        • P(c);XR(B)
  • Actual
    • K(A);S_FLIGHT
    • Vars
      • K(a);N_SPINS(b),P-FLIGHT::QAR(C),XR(d)
      • R(d);SBLOCK::QAB1(C)
      • R(d);N_GUARD::QAR2(C),XR(d)
      • R(d);N_GUARD::QAR2(C)
      • P(c);N_GUARD,N_SPINS(b)::QAR1(C)
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