MESON Chess Problem Database

Problem Display
PID: 169031 (N4Q2/pkNRn3/pppq4/3P4/1R2n3/2p5/8/K7 w - - 0 1)

Oganesyan, Alexei Sergeevich

Comm., SuperProblem 087. TT, 2013

N4Q2/pkNRn3/pppq4/3P4/1R2n3/2p5/8/K7

#2

7 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb4
      • 2.Sb5#
      • 2.Se6#
    • 1...Qc5
      • 2.Sb5#
      • 2.Se6#
    • 1...Qxc7
      • 2.Rxc7#
    • 1...Qxd5
      • 2.Sxd5#
    • 1...Qe6
      • 2.Sxe6#
    • 1...Qf6
      • 2.Sb5#
      • 2.Se6#
    • 1...Qg6
      • 2.Sb5#
      • 2.Se6#
    • 1...Qh6
      • 2.Sb5#
      • 2.Se6#
  • Tries
    • 1.Sb5+?
      • 1...Qc7
        • 2.Rxc7#
      • 1...Qxd7!
    • 1.Se6+?
      • 1...Qc7
        • 2.Rxc7#
      • 1...Qxd7!
  • Keys
    • 1.Sxb6!
      • threat
        • 2.Qa8#
      • 1...Qxb4
        • 2.Sca8#
      • 1...Qxd7
        • 2.Sba8#
      • 1...Sc8
        • 2.Qxc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(f);OGATE,P_SPINQ(f),XS(D)::R1(E),XQ(f)
    • Q(f);XP(C)::R(E)+S(D),XQ(f)
    • Q(f);N_GUARD::R(E)+S(D),XQ(f)
  • Tries
    • Try
      • S(D);CHECK,N_PINP(d)
      • Vars
        • Q(f);N_GUARD,P_SPINQ(f)::R1(E),XQ(f)
      • Refutation
        • Q(f);XR(E)
    • Try
      • S(D);CHECK
      • Vars
        • Q(f);N_GUARD,P_SPINQ(f)::R1(E),XQ(f)
      • Refutation
        • Q(f);XR(E)
  • Actual
    • S(F);XP(d)
    • Threat
      • QAB1(G)
    • Vars
      • Q(f);N_GUARD,XR(B)::R(E)+S(D)
      • Q(f);N_GUARD,XR(E)::R(B)+S(F)
      • S(i);N_GUARD::QAB1(G),XS(i)
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