MESON Chess Problem Database

Problem Display
PID: 21525 (K7/3pRp1p/5PB1/nQPkp1nr/8/3P3p/2N1P3/3r3b w - - 0 1)

Hartong, Jan

Good Companions (November), 1919

K7/3pRp1p/5PB1/nQPkp1nr/8/3P3p/2N1P3/3r3b

#2

9 + 11

3132 The Good Companion Two-Mover 1922
6388 ChessMoves 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Sc4
      • 2.dxc4#
    • 1...Sc6
      • 2.Qc4#
    • 1...Sf3
      • 2.Be4#
      • 2.Bxf7#
      • 2.e4#
    • 1...Se4
      • 2.Bxf7#
    • 1...Se6
      • 2.Rxd7#
    • 1...d6
      • 2.c6#
  • Tries
    • 1.Bxf7+?
      • 1...Se6
        • 2.Rxd7#
      • 1...Sxf7!
    • 1.e4+?
      • 1...Sxe4
        • 2.Bxf7#
      • 1...Bxe4!
  • Keys
    • 1.d4!
      • threat
        • 2.Rxe5#
      • 1...Rxd4
        • 2.Se3#
      • 1...exd4
        • 2.Sb4#
      • 1...Sc4
        • 2.Qb7#
      • 1...Sc6
        • 2.Qb3#
      • 1...Sf3
        • 2.e4#
      • 1...Se4
        • 2.Bxf7#
      • 1...Se6
        • 2.Rxd7#
      • 1...e4
        • 2.Re5#
      • 1...d6
        • 2.c6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(d);OGATE::P(C),XS(d)
    • S(d);N_GUARD,SBLOCK::QAB1(D)
    • S(g);N_GUARD::B(G),XP(j)
    • S(g);SBLOCK::R(H),XP(i)
    • P(i);SBLOCK::QAR(D)+P(E)
  • Tries
    • Try
      • B(G);CHECK,XP(j)
      • Vars
        • S(g);P_SPINS(g)::R(H),XP(i)
      • Refutation
        • S(g);XB(G)
    • Try
      • P(B);CHECK
      • Vars
        • S(g);XP(B)::B(G),XP(j)
      • Refutation
        • B(b);XP(B)
  • Actual
    • P(C);
    • Threat
      • R1(H),XP(f)
    • Vars
      • R(a);SBLOCK,XP(C)::S(A)
      • P(f);SBLOCK,XP(C)::S(A)
      • S(d);N_GUARD,SBLOCK::QAB(D)
      • S(g);N_GUARD,S_CUTB(b)::P(B)
      • S(g);N_GUARD,SBLOCK::B(G),XP(j)
      • S(g);SBLOCK::R(H),XP(i)
      • P(f);::R1(H)
      • P(i);SBLOCK::QAR(D)+P(E)
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