MESON Chess Problem Database

Problem Display
PID: 21948 (B4Qbb/2q5/6p1/pN2n3/K1k1PR1r/Bp5r/2P2N2/8 w - - 0 1)

Hartong, Jan

1st Prize, Good Companions (March), 1922

B4Qbb/2q5/6p1/pN2n3/K1k1PR1r/Bp5r/2P2N2/8

#2

9 + 10

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qb8
      • 2.Qc5#
    • 1...Qd8
      • 2.Qc5#
    • 1...Qc5
      • 2.Qxc5#
    • 1...Qb7
      • 2.Qc5#
    • 1...Qd7
      • 2.Qc5#
    • 1...Qf7
      • 2.Qc5#
    • 1...Qg7
      • 2.Qc5#
    • 1...Qh7
      • 2.Qc5#
    • 1...Rh1
      • 2.cxb3#
    • 1...Rh2
      • 2.cxb3#
    • 1...Bd5
      • 2.Bxd5#
    • 1...Bh7
      • 2.Bd5#
    • 1...Sd3
      • 2.cxb3#
    • 1...Sf3
      • 2.cxb3#
    • 1...Sg4
      • 2.e5#
    • 1...Sc6
      • 2.Qc5#
    • 1...Sd7
      • 2.Qxg8#
    • 1...Sf7
      • 2.Bd5#
  • Tries
    • 1.Qxg8+?
      • 1...Sf7
        • 2.Bd5#
      • 1...Qf7!
  • Keys
    • 1.Sd1!
      • threat
        • 2.Sb2#
      • 1...Sd3
        • 2.cxb3#
      • 1...Sf3
        • 2.Se3#
      • 1...Sg4
        • 2.e5#
      • 1...Sc6
        • 2.Qc5#
      • 1...Sd7
        • 2.Qxg8#
      • 1...Sf7
        • 2.Bd5#
      • 1...b2
        • 2.Sxb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 12
  • Sets
    • Q(h);N_GUARD::QAR1(I)
    • Q(h);N_GUARD::QAR1(I),XQ(h)
    • Q(h);N_GUARD,P_PINS(G)::QAR1(I)
    • R(b);N_GUARD::P(A),XP(a)
    • B(i);N_GUARD::B(H),XB(i)
    • B(i);N_GUARD::B(H)
    • S(f);S_CUTR(b)::P(A),XP(a)
    • S(f);OGATE::R(F)+P(E)
    • S(f);S_CUTQ(h)::QAR1(I)
    • S(f);N_GUARD,S_CUTQ(h)::QAB(I),XB(i)
    • S(f);S_CUTB(i)::B(H)
  • Tries
    • Try
      • Q(I);CHECK,XB(i)
      • Vars
        • S(f);P_SPINS(f)::B(H)
      • Refutation
        • Q(h);P_SPINQ(h)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • S(f);SBLOCK,S_CUTR(b)::P(A),XP(a)
      • S(f);S_CUTR(b)::S(B)
      • S(f);OGATE::R(F)+P(E)
      • S(f);S_CUTQ(h)::QAR1(I)
      • S(f);N_GUARD,S_CUTQ(h)::QAB(I),XB(i)
      • S(f);S_CUTB(i)::B(H)
      • P(a);::S(B),XP(a)
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