MESON Chess Problem Database

Problem Display
PID: 30800 (2B1Q3/8/7K/5pR1/1Bn1nk2/1N5P/4R3/6N1 w - - 0 1)

Loyd, Sam

Sam Loyd and His Chess Problems, 1913

2B1Q3/8/7K/5pR1/1Bn1nk2/1N5P/4R3/6N1

#2

9 + 4

3391 Het Half Pin Thema 1947
17121 Encyclopedia of Chess Problems (Velimirovic/Valtonen) 2012
136 Problem Observer 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Rxf2#
    • 1...Sc3
      • 2.Rf2#
    • 1...Sg3
      • 2.Rf2#
    • 1...Sc5
      • 2.Rf2#
    • 1...Sd6
      • 2.Rf2#
    • 1...Sf6
      • 2.Rf2#
  • Tries
    • 1.Bd6+?
      • 1...Se5
        • 2.Bxe5#
        • 2.Qxe5#
      • 1...Sexd6
        • 2.Rf2#
      • 1...Scxd6!
    • 1.Rf2+?
      • 1...Ke3
        • 2.Rf3#
      • 1...Sxf2!
    • 1.Qe5+?
      • 1...Kxe5
        • 2.Rxf5#
      • 1...Sxe5!
  • Keys
    • 1.Qa4!
      • 1...Ke5
        • 2.Rxf5#
      • 1...Sxg5
        • 2.Bd6#
      • 1...Sb2
        • 2.Bd6#
      • 1...Scd2
        • 2.Bd6#
      • 1...Sa3
        • 2.Bd6#
      • 1...Se3
        • 2.Bd6#
      • 1...Sa5
        • 2.Bd6#
      • 1...Se5
        • 2.Bd2#
      • 1...Sb6
        • 2.Bd6#
      • 1...Scd6
        • 2.Bxd6#
      • 1...Sed2
        • 2.Bxd2#
        • 2.Bd6#
      • 1...Sf2
        • 2.Bd2#
        • 2.Bd6#
      • 1...Sc3
        • 2.Bd6#
      • 1...Sg3
        • 2.Bd2#
        • 2.Bd6#
      • 1...Sc5
        • 2.Bd2#
      • 1...Sed6
        • 2.Bd2#
        • 2.Bxd6#
      • 1...Sf6
        • 2.Bd2#
        • 2.Bd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 10
    • REMOVED MATES = 4
  • Sets
    • S(b);N_GUARD::R(B),XS(b)
    • S(b);N_GUARD::R(B)
  • Tries
    • Try
      • B(E);CHECK
      • Vars
        • S(b);XB(E)::R(B)
      • Refutation
        • S(a);XB(E)
    • Try
      • R(B);CHECK
      • Vars
        • K(c);P_SPINS(b),S_FLIGHT::R1(B)
      • Refutation
        • S(b);XR(B)
    • Try
      • Q(I);CHECK
      • Vars
        • K(c);P_SPINP(d),P_SPINS(b),S_FLIGHT,XQ(I)::R1(F),XP(d)
      • Refutation
        • S(a);XQ(I)
  • Actual
    • Q(I);
    • Vars
      • K(c);P_SPINP(d),P_SPINS(b),S_FLIGHT::R1(F),XP(d)
      • S(b);N_GUARD,S_CUTS(a),S_CUTS(a),XR(F)::B(E)
      • S(a);N_GUARD,S_CUTS(b)::B(E)
      • S(a);N_GUARD,SBLOCK,S_CUTS(b)::B(E)
      • S(a);N_GUARD,S_CUTS(b)::B(E),XS(a)
      • S(b);N_GUARD,S_CUTS(a),S_CUTS(a)::B(E)
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