MESON Chess Problem Database

Problem Display
PID: 231698 (B1bK1N1n/4ppR1/nR5N/4k1p1/4p1P1/1p6/8/b1Q3B1 w - - 0 1)

Anonymous

Pen & Pencil, 1888

(First published on Sat Nov 24 1888)

B1bK1N1n/4ppR1/nR5N/4k1p1/4p1P1/1p6/8/b1Q3B1

#2

9 + 10

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bd4
      • 2.Bh2#
    • 1...Bd7
      • 2.Sxd7#
    • 1...Sb4
      • 2.Qc7#
    • 1...Sc7
      • 2.Qxc7#
    • 1...Sb8
      • 2.Qc7#
    • 1...Sg6
      • 2.Sxf7#
    • 1...e3
      • 2.Qxe3#
  • Tries
    • 1.Kxc8?
      • threat
        • 2.Sd7#
      • 1...e3
        • 2.Qxe3#
      • 1...Sb8
        • 2.Qc7#
      • 1...Sc5!
    • 1.Sg6+?
      • 1...Sxg6
        • 2.Sxf7#
      • 1...fxg6!
    • 1.Rb5+?
      • 1...Kd6
        • 2.Rd5#
        • 2.Qc6#
      • 1...Kf6
        • 2.Qxg5#
      • 1...Sc5!
    • 1.Rxg5+?
      • 1...Bf5
        • 2.Sd7#
        • 2.Rxf5#
      • 1...f5!
    • 1.Qxg5+?
      • 1...Bf5
        • 2.Sd7#
        • 2.Qxf5#
      • 1...f5!
    • 1.Qc3+?
      • 1...Kf4
        • 2.Bh2#
      • 1...Bxc3!
  • Keys
    • 1.Rxf7!
      • 1...Sxf7+
        • 2.Sxf7#
      • 1...Bxg4
        • 2.Sxg4#
      • 1...Bb7
        • 2.Rf5#
        • 2.Qxg5#
      • 1...e3
        • 2.Qxe3#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Bb2
        • 2.Qxb2#
      • 1...Bc3
        • 2.Qxc3#
      • 1...Bd4
        • 2.Bh2#
      • 1...Bf5
        • 2.Rxf5#
      • 1...Be6
        • 2.Rxe6#
      • 1...Bd7
        • 2.Sxd7#
      • 1...Sb4
        • 2.Qc7#
      • 1...Sc7
        • 2.Qxc7#
      • 1...Sb8
        • 2.Qc5#
        • 2.Qc7#
      • 1...Sg6
        • 2.Sxg6#
      • 1...b2
        • 2.Qc3#
      • 1...e6
        • 2.Qxg5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 9
    • REMOVED MATES = 1
  • Sets
    • B(a);SBLOCK::B(B)
    • B(i);N_GUARD::S(I),XB(i)
    • S(f);N_GUARD::QAB(A)
    • S(f);N_GUARD::QAB(A),XS(f)
    • S(j);N_GUARD::S(E),XP(h)
    • P(c);OGATEB::QAR2(A),XP(c)
  • Tries
    • Try
      • K(H);P-FLIGHT,XB(i)
      • Threat
        • S(I)
      • Vars
        • P(c);OGATEB::QAR2(A),XP(c)
        • S(f);N_GUARD::QAB(A)
      • Refutation
        • S(f);
    • Try
      • S(I);CHECK
      • Vars
        • S(j);XS(I)::S(E),XP(h)
      • Refutation
        • P(h);XS(I)
    • Try
      • R(D);CHECK
      • Vars
        • K(d);S_FLIGHT::QAB1(A),XP(e)
      • Refutation
        • S(f);P_SPINS(f)
    • Try
      • R(F);CHECK,XP(e)
      • Refutation
        • P(h);P_SPINP(h)
    • Try
      • Q(A);CHECK,XP(e)
      • Refutation
        • P(h);P_SPINP(h)
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);S_FLIGHT::B(B)
      • Refutation
        • B(a);XQ(A)
  • Actual
    • R(F);XP(h)
    • Vars
      • S(j);CHECK,XR(F)::S(E),XS(j)
      • B(i);XP(C)::S(E),XB(i)
      • P(c);OGATEB::QAR2(A),XP(c)
      • S(f);N_GUARD::QAR2(A),XS(f)
      • B(a);N_GUARD::QAB(A),XB(a)
      • B(a);SBLOCK::B(B)
      • B(i);N_GUARD::R1(F),XB(i)
      • B(i);N_GUARD::R1(D),XB(i)
      • B(i);N_GUARD::S(I),XB(i)
      • S(f);N_GUARD::QAB(A)
      • S(f);N_GUARD::QAB(A),XS(f)
      • S(j);N_GUARD::S(I),XS(j)
      • P(b);S_CUTB(a)::QAB(A)
      • P(g);S_CUTB(i)::QAR2(A),XP(e)
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