MESON Chess Problem Database

Problem Display
PID: 106268 (1B2R3/3P1b1B/r1pnq2R/3nk2p/2P5/8/5Q1K/8 w - - 0 1)

Pituk, Alexander

Praca, 1947

1B2R3/3P1b1B/r1pnq2R/3nk2p/2P5/8/5Q1K/8

#2

8 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe7
      • 2.Bxd6#
    • 1...Qxe8
      • 2.Bxd6#
    • 1...Bg8
      • 2.Rxh5#
    • 1...Sc3
      • 2.Qf6#
    • 1...Se3
      • 2.Qxe3#
      • 2.Qf6#
    • 1...Sb4
      • 2.Qe3#
      • 2.Qf6#
    • 1...Sf4
      • 2.Qe3#
      • 2.Qb2#
    • 1...Sb6
      • 2.Qe3#
      • 2.Qf6#
    • 1...Sf6
      • 2.Qxf6#
    • 1...Sc7
      • 2.Qf6#
    • 1...Se7
      • 2.Qe3#
  • Tries
    • 1.Qe1+?
      • 1...Kf4
        • 2.Qg3#
      • 1...Se3
        • 2.Qxe3#
      • 1...Kd4!
    • 1.Qg3+?
      • 1...Sf4
        • 2.Qc3#
        • 2.Qe3#
        • 2.Qg7#
      • 1...Kd4!
  • Keys
    • 1.d8S!
      • threat
        • 2.Sxf7#
      • 1...Qxe8
        • 2.Bxd6#
      • 1...Bxe8
        • 2.Rxe6#
      • 1...Bg6
        • 2.Rxe6#
      • 1...Se3
        • 2.Qxe3#
        • 2.Qf6#
      • 1...Ra7
        • 2.Sxc6#
      • 1...Bg8
        • 2.Rxh5#
      • 1...Sc7
        • 2.Qf6#
      • 1...Se7
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(g);::B(G),XS(f)
    • Q(g);N_SPINQ(g),XR(H)::B(G),XS(f)
    • B(h);N_GUARD::R(D),XP(c)
    • S(a);N_GUARD::QAB1(A)
    • S(a);N_GUARD::QAB1(A),XS(a)
    • S(a);N_GUARD,N_SPINS(f)::QAB1(A)
    • S(a);N_GUARD,N_SPINQ(g)::QAR2(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);N_SPINQ(g),S_FLIGHT::QAB1(A)
        • S(a);N_GUARD,N_SPINS(f),P_SPINS(a)::QAR2(A),XS(a)
      • Refutation
        • K(b);N_SPINQ(g),N_SPINS(f),S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(b);N_SPINQ(g),N_SPINS(f),S_FLIGHT
  • Actual
    • P(E);
    • Threat
      • S(E),XB(h)
    • Vars
      • Q(g);N_SPINQ(g),XR(H)::B(G),XS(f)
      • B(h);N_GUARD,N_SPINQ(g),XR(H)::R1(D),XQ(g)
      • B(h);N_GUARD::R1(H),XQ(g)
      • R(d);N_GUARD::S(E),XP(e)
      • B(h);N_GUARD::R(D),XP(c)
      • S(a);N_GUARD,N_SPINS(f)::QAB1(A)
      • S(a);N_GUARD,N_SPINQ(g)::QAR2(A)
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