MESON Chess Problem Database

Problem Display
PID: 105548 (8/8/5N2/B2N1qp1/3p4/KR6/4Pk1P/4R2B w - - 0 1)

Kamensky, Viktor Ivanovich

Kopnin MT, 1998

8/8/5N2/B2N1qp1/3p4/KR6/4Pk1P/4R2B

#2

9 + 4

6490 yacpdb 2009
5454 Near Snap 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Sg4#
      • 2.Rf3#
    • 1...Qc2
      • 2.Sg4#
      • 2.Rf3#
    • 1...Qd3
      • 2.Sg4#
    • 1...Qh3
      • 2.Se4#
    • 1...Qe4
      • 2.Sxe4#
    • 1...Qg4
      • 2.Sxg4#
    • 1...Qe6
      • 2.Rf3#
    • 1...Qg6
      • 2.Sg4#
      • 2.Rf3#
    • 1...Qd7
      • 2.Se4#
      • 2.Rf3#
    • 1...Qh7
      • 2.Sg4#
      • 2.Rf3#
    • 1...Qc8
      • 2.Se4#
      • 2.Rf3#
    • 1...Qf3
      • 2.Rxf3#
    • 1...Qxd5
      • 2.Sg4#
    • 1...Qe5
      • 2.Sg4#
      • 2.Rf3#
  • Tries
    • 1.Rg3?
      • threat
        • 2.Rg2#
      • 1...Qf3+
        • 2.Rxf3#
      • 1...Qxd5
        • 2.Sg4#
      • 1...Qh3
        • 2.Se4#
      • 1...Qe4
        • 2.Sxe4#
      • 1...Qg4
        • 2.Sxg4#
      • 1...Qd3+!
  • Keys
    • 1.Rb2!
      • threat
        • 2.e4#
      • 1...Qd3+
        • 2.exd3#
      • 1...Qh3+
        • 2.e3#
      • 1...Qf3+
        • 2.exf3#
      • 1...Qf4
        • 2.e3#
      • 1...Qb1
        • 2.Sg4#
      • 1...Qc2
        • 2.Sg4#
      • 1...Qe4
        • 2.Sxe4#
      • 1...Qg4
        • 2.Sxg4#
      • 1...Qc8
        • 2.Se4#
      • 1...d3
        • 2.exd3#

Anticipated by 60457(1981)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • Q(c);N_GUARD,P_PINR(F)::S(I)
    • Q(c);N_GUARD::S(I),XQ(c)
    • Q(c);N_GUARD::R1(F)
    • Q(c);N_GUARD,P_PINR(F)::R1(F),XQ(c)
    • Q(c);N_GUARD,XS(H)::S(I)
  • Tries
    • Try
      • R(F);
      • Threat
        • R1(F)
      • Vars
        • Q(c);CHECK,N_GUARD::R1(F),XQ(c)
        • Q(c);N_GUARD,XS(H)::S(I)
        • Q(c);N_GUARD,P_PINR(F)::S(I)
        • Q(c);N_GUARD::S(I),XQ(c)
      • Refutation
        • Q(c);CHECK
  • Actual
    • R(F);
    • Threat
      • R(F)+P(C)
    • Vars
      • Q(c);CHECK,OGATE::R(F)+P(C),XQ(c)
      • Q(c);CHECK,N_GUARD::R(F)+P(C)
      • Q(c);N_GUARD::R(F)+P(C)
      • Q(c);N_GUARD::S(I)
      • Q(c);N_GUARD::S(I),XQ(c)
      • P(b);OGATE::R(F)+P(C),XP(b)
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