MESON Chess Problem Database

Problem Display
PID: 178134 (8/2p2Q2/p2q1p2/5np1/1R1Pkp2/4N1P1/KB2R3/4N3 w - - 0 1)

Ancin, Andrej

5th Comm., Schach-Echo, 1972

8/2p2Q2/p2q1p2/5np1/1R1Pkp2/4N1P1/KB2R3/4N3

#2

9 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb4
      • 2.Qd5#
      • 2.Qe6#
    • 1...Qe7
      • 2.Qd5#
    • 1...Qf8
      • 2.Qd5#
      • 2.Qe6#
    • 1...Qxd4
      • 2.Qd5#
      • 2.Qe6#
    • 1...Qd5+
      • 2.Qxd5#
    • 1...Qb6
      • 2.Qd5#
    • 1...Qe6+
      • 2.Qxe6#
    • 1...Qd8
      • 2.Qe6#
  • Tries
    • 1.Qe6+?
      • 1...Qe5
        • 2.Sxf5#
      • 1...Qxe6+!
    • 1.Qg6?
      • threat
        • 2.Qxf5#
      • 1...Qd5+
        • 2.Sc4#
      • 1...Qe6+
        • 2.d5#
      • 1...Qc5
        • 2.dxc5#
      • 1...Qe5
        • 2.dxe5#
      • 1...Qd7
        • 2.d5#
      • 1...fxe3!
    • 1.d5+?
      • 1...Qxb4
        • 2.Qe6#
      • 1...Sd4!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Qxf5#
      • 1...Qd5+
        • 2.Sc4#
      • 1...Qe6+
        • 2.d5#
      • 1...fxe3
        • 2.Qh1#
      • 1...Qc5
        • 2.dxc5#
      • 1...Qe5
        • 2.dxe5#
      • 1...Qd7
        • 2.d5#

This is a version of 92197

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • Q(f);N_GUARD::QAB1(I)
    • Q(f);CHECK,N_GUARD::QAB1(I),XQ(f)
    • Q(f);CHECK,N_GUARD::QAR2(I),XQ(f)
    • Q(f);N_GUARD::QAR2(I)
  • Tries
    • Try
      • Q(I);CHECK
      • Vars
        • Q(f);P_SPINQ(f)::R(D)+S(E),XS(c)
      • Refutation
        • Q(f);CHECK,XQ(I)
    • Try
      • Q(I);P_PINS(c)
      • Threat
        • QAB1(I),XS(c)
      • Vars
        • Q(f);CHECK,SBLOCK::R(D)+S(E)
        • Q(f);CHECK,N_GUARD::R(G)+P(H)
        • Q(f);OGATE::R(G)+P(H),XQ(f)
        • Q(f);N_GUARD::R(G)+P(H)
      • Refutation
        • P(b);P_SPINP(b),XS(E)
    • Try
      • P(H);CHECK
      • Vars
        • Q(f);XR(G)::QAR2(I)
      • Refutation
        • S(c);P_SPINS(c)
  • Actual
    • Q(I);P_PINS(c)
    • Threat
      • QAB1(I),XS(c)
    • Vars
      • Q(f);CHECK,SBLOCK::R(D)+S(E)
      • Q(f);CHECK,N_GUARD::R(G)+P(H)
      • P(b);N_GUARD,P_SPINP(b),XS(E)::QAB(I)
      • Q(f);OGATE::R(G)+P(H),XQ(f)
      • Q(f);N_GUARD::R(G)+P(H)
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