MESON Chess Problem Database

Problem Display
PID: 71668 (1qnQ3K/6p1/R1N3p1/2pP1k2/2R5/2bP3P/5NrB/1B6 w - - 0 1)

Gugel, Lev Nikolaevich

5th Prize, Shakhmatny Listok, 1929

1qnQ3K/6p1/R1N3p1/2pP1k2/2R5/2bP3P/5NrB/1B6

#2

11 + 8

14752 Soviet Chess Compositions (1945-1947) 1947

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Rxf4#
    • 1...Qd6
      • 2.d4#
    • 1...Qa7
      • 2.Rf4#
      • 2.d4#
    • 1...Qc7
      • 2.d4#
    • 1...Qxb1
      • 2.Rf4#
    • 1...Qb2
      • 2.Rf4#
    • 1...Qb3
      • 2.Rf4#
    • 1...Qb5
      • 2.Rf4#
    • 1...Qb6
      • 2.Rf4#
    • 1...Qb7
      • 2.Rf4#
    • 1...Qa8
      • 2.Rf4#
      • 2.d4#
    • 1...Rg4
      • 2.hxg4#
    • 1...Bb2
      • 2.d4#
    • 1...Bb4
      • 2.d4#
    • 1...Sb6
      • 2.d4#
    • 1...Sd6
      • 2.Rf4#
  • Tries
    • 1.Qd7+?
      • 1...Kf6
        • 2.Se4#
      • 1...Kg5!
  • Keys
    • 1.Rg4!
      • threat
        • 2.Qg5#
      • 1...Rxg4
        • 2.hxg4#
      • 1...Se7
        • 2.Sxe7#
      • 1...g5
        • 2.Qxg5#
      • 1...Qf4
        • 2.Rxf4#
      • 1...Bd2
        • 2.Qf8#
      • 1...Bf6
        • 2.Qd7#
      • 1...Sb6
        • 2.d4#
      • 1...Sd6
        • 2.Rf4#
      • 1...Sa7
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 10
  • Sets
    • Q(g);N_GUARD::R1(F),XQ(g)
    • Q(g);N_GUARD::B(A)+P(D)
    • Q(g);N_GUARD,XB(A)::R1(F)
    • Q(g);N_GUARD::R1(F)
    • R(a);OGATE::P(E),XR(a)
    • B(b);S_CUTQ(g)::B(A)+P(D)
    • S(h);P_PINQ(J),S_CUTQ(g)::B(A)+P(D)
    • S(h);P_PINQ(J),S_CUTQ(g)::R1(F)
  • Tries
    • Try
      • Q(J);CHECK
      • Vars
        • K(d);P-FLIGHT::S(B)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • R(F);
    • Threat
      • QAR1(J)
    • Vars
      • R(a);OGATE,XR(F)::P(E),XR(a)
      • S(h);N_GUARD,P_PINQ(J)::S(I),XS(h)
      • P(e);::QAR1(J),XP(e)
      • Q(g);N_GUARD::R1(F),XQ(g)
      • B(b);N_GUARD::QAR(J)
      • B(b);SBLOCK::QAB(J)
      • S(h);P_PINQ(J),S_CUTQ(g)::B(A)+P(D)
      • S(h);P_PINQ(J),S_CUTQ(g)::R1(F)
      • S(h);N_GUARD,P_PINQ(J)::S(I)
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