MESON Chess Problem Database

Problem Display
PID: 138084 (6b1/b4Q1P/2P3BR/2nPk2p/5p2/K1R1Pqnr/2PP1P1N/B7 w - - 0 1)

Kopnin, Aleksey Grigorevich

5th Comm., Trud, 1947

6b1/b4Q1P/2P3BR/2nPk2p/5p2/K1R1Pqnr/2PP1P1N/B7

#2

14 + 9

14752 Soviet Chess Compositions (1945-1947) 1949

SOLUTION

  • SOUND
  • Tries
    • 1.Qe7+?
      • 1...Be6
        • 2.Rd3#
        • 2.Rxc5#
      • 1...Se6
        • 2.Rc5#
      • 1...Kxd5!
  • Keys
    • 1.Be4!
      • threat
        • 2.Rc4#
      • 1...Kxe4
        • 2.Rc4#
      • 1...Qxe4
        • 2.h8Q#
        • 2.h8B#
      • 1...Qxe3
        • 2.Rxe3#
      • 1...Sgxe4
        • 2.d4#
      • 1...Scxe4
        • 2.Sxf3#
      • 1...Se6
        • 2.Rxe6#
      • 1...Qd1
        • 2.Qxf4#
      • 1...Qh1
        • 2.Qxf4#
      • 1...Se2
        • 2.Qf5#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sb3
        • 2.Re6#
      • 1...Sd3
        • 2.Re6#
      • 1...Sa4
        • 2.Re6#
      • 1...Sa6
        • 2.Re6#
      • 1...Sb7
        • 2.Re6#
      • 1...Sd7
        • 2.Re6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 15
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(M);CHECK
      • Vars
        • S(e);P_SPINS(e)::B(A)+R(G)
      • Refutation
        • K(f);P-FLIGHT,XP(I)
  • Actual
    • B(K);
    • Threat
      • B(A)+R(G)
    • Vars
      • K(f);P-FLIGHT,XB(K)::R(G)
      • Q(a);SBLOCK,XB(K)::P=Q
      • Q(a);OGATE,P_PINR(G),XP(H)::B(A)+R(G),XQ(a)
      • S(b);SBLOCK,XB(K)::P(C)
      • S(e);SBLOCK,XB(K)::S(E),XQ(a)
      • S(e);N_GUARD::R1(L),XS(e)
      • Q(a);N_GUARD::QAB1(M),XP(d)
      • S(b);N_GUARD::QAR1(M)
      • S(b);N_GUARD::QAR1(M),XS(b)
      • S(e);N_GUARD::R1(L)
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