MESON Chess Problem Database

Problem Display
PID: 179702 (8/2p2p1r/1pQN1nR1/1K2k1p1/2B1p3/1pp1B1nq/3R2p1/3r4 w - - 0 1)

Kopnin, Aleksey Grigorevich

5th Prize, Bulgaria-1300 JT, 1983

8/2p2p1r/1pQN1nR1/1K2k1p1/2B1p3/1pp1B1nq/3R2p1/3r4

#2

7 + 14

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sg4
      • 2.Qd5#
      • 2.Qe8#
    • 1...Sd5
      • 2.Qxd5#
    • 1...Sh5
      • 2.Qd5#
    • 1...Sd7
      • 2.Qd5#
    • 1...Se8
      • 2.Qd5#
    • 1...Sg8
      • 2.Qd5#
  • Tries
    • 1.Sf5?
      • threat
        • 2.Qxf6#
      • 1...Kxf5
        • 2.Rxg5#
      • 1...Qxf5
        • 2.Qxc7#
      • 1...fxg6
        • 2.Qe6#
      • 1...Sg4
        • 2.Qd5#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Sfh5
        • 2.Qd5#
      • 1...Sd7
        • 2.Qd5#
      • 1...Se8
        • 2.Qd5#
      • 1...Sg8
        • 2.Qd5#
      • 1...Sgh5!
    • 1.Sxf7+?
      • 1...Kf5
        • 2.Rxg5#
      • 1...Rxf7!
    • 1.Qc5+?
      • 1...Sd5
        • 2.Qd4#
        • 2.Qxd5#
      • 1...bxc5!
  • Keys
    • 1.Be6!
      • threat
        • 2.Sc4#
      • 1...Kxe6
        • 2.Qe8#
      • 1...Qxe6
        • 2.Qxc3#
      • 1...cxd6
        • 2.Qxd6#
      • 1...fxe6
        • 2.Qxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • S(k);N_GUARD::QAR1(E),XS(k)
    • S(k);N_GUARD::QAR1(E)
  • Tries
    • Try
      • S(F);
      • Threat
        • QAB1(E),XS(k)
      • Vars
        • K(h);OGATEB,P-FLIGHT,XS(F)::R1(G),XP(i)
        • Q(f);SBLOCK,XS(F)::QAB(E),XP(l)
        • P(m);N_GUARD,XR(G)::QAR1(E)
        • S(k);N_GUARD::QAR1(E)
        • S(k);N_GUARD::QAR1(E),XS(k)
      • Refutation
        • S(e);
    • Try
      • S(F);CHECK,XP(m)
      • Vars
        • K(h);P-FLIGHT::R1(G),XP(i)
      • Refutation
        • R(n);XS(F)
    • Try
      • Q(E);CHECK
      • Refutation
        • P(j);XQ(E)
  • Actual
    • B(C);
    • Threat
      • S(F)
    • Vars
      • K(h);OGATEB,P-FLIGHT,P_SPINS(k),XB(C)::QAR2(E)
      • Q(f);SBLOCK,XB(C)::QAB(E),XP(d)
      • P(l);OGATE,XS(F)::QAB1(E),XP(l)
      • P(m);SBLOCK,XB(C)::QAB(E),XP(d)
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