MESON Chess Problem Database

Problem Display
PID: 64289 (2N2b2/Q4prb/pNk2n2/r7/1Pq5/P1n5/p5R1/K1R3BB w - - 0 1)

Hartong, Jan

Good Companions (May), 1919

2N2b2/Q4prb/pNk2n2/r7/1Pq5/P1n5/p5R1/K1R3BB

#2

10 + 11

3132 The Good Companion Two-Mover 1922
133 The Problemist Supplement 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Sb5
      • 2.Rg6#
    • 1...Se4
      • 2.Qd7#
    • 1...Sg4
      • 2.Qd7#
    • 1...Sd5
      • 2.Qd7#
    • 1...Sh5
      • 2.Qd7#
    • 1...Sd7
      • 2.Qxd7#
    • 1...Se8
      • 2.Qd7#
    • 1...Sg8
      • 2.Qd7#
  • Tries
    • 1.Rg6+?
      • 1...Qd5
        • 2.Qd7#
      • 1...Qe4
        • 2.Qd7#
      • 1...Rd5
        • 2.Qd7#
      • 1...Se4
        • 2.Qd7#
      • 1...Sd5
        • 2.Qd7#
      • 1...Kb5!
    • 1.Qb7+?
      • 1...Kb5
        • 2.Sa7#
      • 1...Kxb7!
    • 1.Qc7+?
      • 1...Kb5
        • 2.Sa7#
        • 2.Qxc4#
      • 1...Kxc7!
    • 1.Qa8+?
      • 1...Kb5
        • 2.Sa7#
      • 1...Kc7!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Sa7#
      • 1...Kb5
        • 2.Sa7#
      • 1...Sb5
        • 2.Rg6#

This is a version

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • S(b);N_GUARD,P_SPINQ(c),SBLOCK,S_CUTR(d)::B(D)+R(E)
    • S(g);N_GUARD::QAB1(I)
    • S(g);N_GUARD::QAB1(I),XS(g)
  • Tries
    • Try
      • R(E);CHECK,P_PINS(g)
      • Vars
        • Q(c);N_SPINS(g),P_SPINQ(c),P_SPINS(b)::QAB1(I)
        • R(d);P_SPINR(d)::QAB1(I)
        • S(b);N_SPINS(g),P_SPINQ(c),P_SPINS(b)::QAB1(I)
      • Refutation
        • K(f);N_SPINS(g),S_FLIGHT
    • Try
      • Q(I);CHECK
      • Vars
        • K(f);S_FLIGHT::S(J)
      • Refutation
        • K(f);S_FLIGHT,XQ(I)
    • Try
      • Q(I);CHECK
      • Refutation
        • K(f);P-FLIGHT,XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • K(f);S_FLIGHT::S(J)
      • Refutation
        • K(f);P-FLIGHT
  • Actual
    • Q(I);
    • Threat
      • S(J)
    • Vars
      • K(f);S_FLIGHT::S(J)
      • S(b);N_GUARD,P_SPINQ(c),SBLOCK,S_CUTR(d)::B(D)+R(E)
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