MESON Chess Problem Database

Problem Display
PID: 180312 (8/7B/5Q2/2p3p1/2p3N1/8/p1PkP1PR/R3nK2 w - - 0 1)

Lider, Valentin Viktorovich

3rd Prize, Makuc/Moder MT, 1985

8/7B/5Q2/2p3p1/2p3N1/8/p1PkP1PR/R3nK2

#2

9 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...c3
      • 2.Qxg5#
  • Tries
    • 1.e3?
      • 1...Sxc2
        • 2.g3#
      • 1...Sxg2
        • 2.Rxg2#
      • 1...Sf3
        • 2.gxf3#
      • 1...c3
        • 2.Qf2#
      • 1...Sd3!
    • 1.g3?
      • 1...Sxc2
        • 2.e3#
      • 1...Sd3
        • 2.exd3#
      • 1...Sf3
        • 2.exf3#
      • 1...c3
        • 2.Qxg5#
      • 1...Sg2!
  • Keys
    • 1.Qb2!
      • 1...Sxc2
        • 2.Qxc2#
      • 1...Sxg2
        • 2.c3#
      • 1...Sd3
        • 2.cxd3#
      • 1...Sf3
        • 2.c3#
      • 1...c3
        • 2.Qc1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(d);SBLOCK::QAB(H),XP(f)
  • Tries
    • Try
      • P(D);
      • Vars
        • S(a);N_GUARD,XP(C)::R(F)+P(E)
        • S(a);OGATE,P_SPINS(a),XP(E)::R(F),XS(a)
        • S(a);OGATE::R(F)+P(E),XS(a)
        • P(d);SBLOCK::QAR2(H)
      • Refutation
        • S(a);
    • Try
      • P(E);
      • Vars
        • S(a);N_GUARD,XP(C)::R(F)+P(D)
        • S(a);OGATE::R(F)+P(D),XS(a)
        • P(d);SBLOCK::QAB(H),XP(f)
      • Refutation
        • S(a);
  • Actual
    • Q(H);
    • Vars
      • S(a);OGATE,P_SPINS(a),XP(C)::QAR1(H),XS(a)
      • S(a);N_GUARD,XP(E)::QAR(H)+P(C)
      • S(a);OGATE::QAR(H)+P(C),XS(a)
      • S(a);N_GUARD::QAR(H)+P(C)
      • P(d);SBLOCK::QAB1(H)
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