MESON Chess Problem Database

Problem Display
PID: 22420 (4R3/pB2N3/1b2pQn1/B7/RN4p1/P3k1P1/p7/rb1nK3 w - - 0 1)

Blackburne, SS

1st Prize, Otago Witness, 1899

4R3/pB2N3/1b2pQn1/B7/RN4p1/P3k1P1/p7/rb1nK3

#2

10 + 10

15 British Chess Magazine 1900
2794 Terms & Themes of Chess Problems 1907

SOLUTION

  • SOUND
  • Sets
    • 1...Bf5
      • 2.Sxf5#
    • 1...Sb2
      • 2.Qf2#
    • 1...Sf2
      • 2.Qxf2#
    • 1...Sc3
      • 2.Qf2#
    • 1...Sf4
      • 2.Qxf4#
    • 1...Sh4
      • 2.Qf4#
    • 1...Se5
      • 2.Qf4#
    • 1...Sxe7
      • 2.Qf4#
    • 1...Sf8
      • 2.Qf4#
    • 1...Sh8
      • 2.Qf4#
    • 1...a6
      • 2.Bxb6#
  • Tries
    • 1.Sc2+?
      • 1...Kd3
        • 2.Be4#
        • 2.Qxg6#
      • 1...Bxc2!
    • 1.Sbd5+?
      • 1...Kd3
        • 2.Qxg6#
      • 1...exd5!
    • 1.Qc3+?
      • 1...Bd3
        • 2.Sc2#
        • 2.Sf5#
        • 2.Qxd3#
      • 1...Sxc3!
    • 1.Qe5+?
      • 1...Be4
        • 2.Qxe4#
      • 1...Sxe5!
    • 1.Qg5+?
      • 1...Sf4
        • 2.Qxf4#
      • 1...Kd4!
    • 1.Qf3+?
      • 1...Kd4
        • 2.Sd3#
      • 1...gxf3!
  • Keys
    • 1.Qf5!
      • 1...Kd4
        • 2.Sc2#
      • 1...Bxf5
        • 2.Sxf5#
      • 1...Bxa5
        • 2.Qc5#
      • 1...Sxe7
        • 2.Qf4#
      • 1...exf5
        • 2.Sxf5#
      • 1...Be4
        • 2.Qxe4#
      • 1...Bc2
        • 2.Sxc2#
      • 1...Bd3
        • 2.Qxd3#
      • 1...Bd4
        • 2.Sed5#
      • 1...Bc5
        • 2.Qxc5#
      • 1...Bc7
        • 2.Qc5#
      • 1...Bd8
        • 2.Qc5#
      • 1...Sb2
        • 2.Qf2#
      • 1...Sf2
        • 2.Qxf2#
      • 1...Sc3
        • 2.Qf2#
      • 1...Sf4
        • 2.Qxf4#
      • 1...Sh4
        • 2.Qf4#
      • 1...Se5
        • 2.Qf4#
      • 1...Sf8
        • 2.Qf4#
      • 1...Sh8
        • 2.Qf4#
      • 1...e5
        • 2.Sbd5#
      • 1...a6
        • 2.Bxb6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 11
    • REMOVED MATES = 0
  • Sets
    • B(b);N_GUARD::S(I),XB(b)
    • S(c);N_GUARD::QAB1(G)
    • S(c);N_GUARD::QAB1(G),XS(c)
    • S(i);N_GUARD::QAB1(G),XS(i)
    • S(i);N_GUARD::QAB1(G)
    • S(i);N_GUARD,XS(I)::QAB1(G)
    • P(j);N_GUARD::B(F),XB(g)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • B(b);XS(E)
    • Try
      • S(E);CHECK
      • Vars
        • K(e);P-FLIGHT::QAB(G),XS(i)
      • Refutation
        • P(h);XS(E)
    • Try
      • Q(G);CHECK
      • Refutation
        • S(c);XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(G),XB(b)
      • Refutation
        • S(i);XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • S(i);N_GUARD,P_SPINS(i)::QAB1(G),XS(i)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • K(e);S_FLIGHT::R(D)+S(E)
      • Refutation
        • P(f);XQ(G)
  • Actual
    • Q(G);
    • Vars
      • K(e);S_FLIGHT::R(D)+S(E),DCHECK
      • B(b);XQ(G)::S(I),XB(b)
      • B(g);N_GUARD,P_PINS(E),XB(F)::QAB(G)
      • S(i);N_GUARD,XS(I)::QAB1(G)
      • P(h);XQ(G)::R(J)+S(I),DCHECK,XP(h)
      • B(b);N_GUARD::QAR1(G),XB(b)
      • B(b);N_GUARD::S(E),XB(b)
      • B(g);SBLOCK::S(I)
      • B(g);N_GUARD::QAB(G),XB(g)
      • B(g);N_GUARD::QAB(G)
      • S(c);N_GUARD::QAB1(G)
      • S(c);N_GUARD::QAB1(G),XS(c)
      • S(i);N_GUARD::QAB1(G),XS(i)
      • S(i);N_GUARD::QAB1(G)
      • P(h);N_GUARD::S(E)
      • P(j);N_GUARD::B(F),XB(g)
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