MESON Chess Problem Database

Problem Display
PID: 140173 (3N2q1/1Bb5/R6r/nQ1pk1B1/3pr1Pn/3PN3/KP6/4R2b w - - 0 1)

Petrov, Evgeny Aleksandrovich

Probleemblad, 1975

3N2q1/1Bb5/R6r/nQ1pk1B1/3pr1Pn/3PN3/KP6/4R2b

#2

11 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qf7
      • 2.Sxf7#
    • 1...Qh7
      • 2.Qxd5#
    • 1...Qg6
      • 2.Qxd5#
    • 1...Qg7
      • 2.Qxd5#
    • 1...Qe8
      • 2.Qxd5#
    • 1...Qf8
      • 2.Qxd5#
    • 1...Qh8
      • 2.Sf7#
      • 2.Qxd5#
    • 1...Rf4
      • 2.Sc4#
    • 1...Re6
      • 2.Qxd5#
    • 1...Sb3
      • 2.Sc4#
    • 1...Sc4
      • 2.Sxc4#
    • 1...Sc6
      • 2.Sc4#
    • 1...Sxb7
      • 2.Sc4#
  • Tries
    • 1.Bf4+?
      • 1...Rxf4
        • 2.Sc4#
      • 1...Kxf4!
    • 1.Re6+?
      • 1...Rxe6
        • 2.Qxd5#
      • 1...Qxe6!
  • Keys
    • 1.Sxd5!
      • threat
        • 2.Bf4#
      • 1...Qxd5+
        • 2.Qxd5#
      • 1...Qxg5
        • 2.Sf7#
      • 1...Qf7
        • 2.Sxf7#
      • 1...Qf8
        • 2.Se7#
      • 1...Rf6
        • 2.Bxf6#
      • 1...Sg2
        • 2.Rxe4#
      • 1...Sg6
        • 2.Bf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 10
  • Sets
    • Q(j);N_GUARD::S(K),XQ(j)
    • Q(j);N_GUARD::QAR1(G),XP(f)
    • R(c);::R(A)+S(E),DCHECK
    • R(h);S_CUTQ(j)::QAR1(G),XP(f)
    • S(e);N_GUARD::S(E)
    • S(e);N_GUARD::S(E),XS(e)
    • S(e);N_GUARD,XB(J)::S(E)
  • Tries
    • Try
      • B(H);CHECK
      • Vars
        • R(c);SBLOCK,XB(H)::R(A)+S(E),DCHECK
      • Refutation
        • K(g);N_SPINP(f),S_FLIGHT,XB(H)
    • Try
      • R(I);CHECK
      • Vars
        • R(h);XR(I)::QAR1(G),XP(f)
      • Refutation
        • Q(j);XR(I)
  • Actual
    • S(E);P_PINR(c),P_SPINS(E),XP(f)
    • Threat
      • B(H)
    • Vars
      • Q(j);CHECK,OGATE,P_SPINQ(j),XS(E)::QAR1(G),XQ(j)
      • Q(j);N_GUARD,N_PINS(E),XB(H)::S(K)
      • Q(j);N_GUARD::S(K),XQ(j)
      • Q(j);N_PINS(E)::QAR(G)+S(E)
      • R(h);N_GUARD::B(H),XR(h)
      • S(d);S_CUTB(a)::R1(A),XR(c)
      • S(d);S_CUTR(h)::B(H)
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