MESON Chess Problem Database

Problem Display
PID: 250626 (8/3P4/2p2N2/RbPR1P2/p1kN4/P2p4/pn1K2Q1/B7 w - - 0 1)

Gorbatenko, Yuri Grigorevich

Kopnin, Aleksey Grigorevich

4th Prize, Schach, 1986

8/3P4/2p2N2/RbPR1P2/p1kN4/P2p4/pn1K2Q1/B7

#2

11 + 7

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...cxd5
      • 2.Qxd5#
  • Tries
    • 1.Sg4?
      • threat
        • 2.Se3#
        • 2.Se5#
      • 1...Sd1
        • 2.Se5#
      • 1...cxd5!
    • 1.Rxb5?
      • threat
        • 2.Rb4#
      • 1...cxd5
        • 2.Qxd5#
      • 1...cxb5!
    • 1.Re5?
      • 1...Kxd4
        • 2.Qe4#
      • 1...Sd1
        • 2.Qg8#
      • 1...Ba6!
    • 1.Rd6?
      • 1...Kxc5
        • 2.Qxc6#
      • 1...Ba6
        • 2.Qg8#
      • 1...Sd1!
    • 1.Qf1?
      • threat
        • 2.Qc1#
      • 1...Sd1
        • 2.Qxd3#
      • 1...cxd5!
    • 1.Qh1?
      • threat
        • 2.Qc1#
      • 1...cxd5
        • 2.Qxd5#
      • 1...Sd1!
    • 1.Qf3?
      • 1...cxd5
        • 2.Qxd5#
      • 1...Sd1
        • 2.Qxd3#
      • 1...Ba6!
    • 1.Qe4?
      • 1...cxd5
        • 2.Qxd5#
      • 1...Sd1
        • 2.Qxd3#
      • 1...Ba6!
  • Keys
    • 1.Qg8!
      • 1...cxd5
        • 2.Qxd5#
      • 1...Ba6
        • 2.Rd6#
      • 1...Sd1
        • 2.Re5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(g);OGATE,XR(H)::QAB1(C),XP(g)
  • Tries
    • Try
      • S(J);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);::S(J)
      • Refutation
        • P(g);XR(H)
    • Try
      • R(F);XB(f)
      • Threat
        • R1(F)
      • Vars
        • P(g);OGATE,XR(H)::QAB1(C),XP(g)
      • Refutation
        • P(g);XR(F)
    • Try
      • R(H);
      • Vars
        • K(e);OGATEB,P-FLIGHT,P_SPINS(b),XS(E)::QAR1(C)
        • S(b);::QAB(C)
      • Refutation
        • B(f);
    • Try
      • R(H);
      • Vars
        • K(e);OGATEB,P-FLIGHT,P_SPINB(f),XP(G)::QAR1(C),XP(g)
        • B(f);::QAB(C)
      • Refutation
        • S(b);
    • Try
      • Q(C);P_PINP(c)
      • Threat
        • QAR(C)
      • Vars
        • S(b);N_GUARD::QAB1(C),XP(c)
      • Refutation
        • P(g);XR(H)
    • Try
      • Q(C);
      • Threat
        • QAR(C)
      • Vars
        • P(g);OGATE,XR(H)::QAB1(C),XP(g)
      • Refutation
        • S(b);
    • Try
      • Q(C);
      • Vars
        • P(g);OGATE,XR(H)::QAB1(C),XP(g)
        • S(b);N_GUARD::QAB1(C),XP(c)
      • Refutation
        • B(f);
    • Try
      • Q(C);
      • Vars
        • P(g);OGATE,XR(H)::QAB1(C),XP(g)
        • S(b);N_GUARD::QAB1(C),XP(c)
      • Refutation
        • B(f);
  • Actual
    • Q(C);
    • Vars
      • P(g);OGATE,P_SPINP(g),XR(H)::QAB1(C),XP(g)
      • B(f);::QAB(C)+R(H)
      • S(b);::QAB(C)+R(H)
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