MESON Chess Problem Database

Problem Display
PID: 64633 (2R4b/6B1/7r/p6r/K1Bq4/pNkP1R2/5Q1p/1n6 w - - 0 1)

Guidelli, Giorgio

3rd Prize, Good Companions (May), 1916

2R4b/6B1/7r/p6r/K1Bq4/pNkP1R2/5Q1p/1n6

#2

8 + 9

3132 The Good Companion Two-Mover 1922
721 Variantim 1990
14868 Pirnie Collection 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Be6#
    • 1...Qf6
      • 2.Bd5#
    • 1...Qxg7
      • 2.d4#
    • 1...Sd2
      • 2.Qxd2#
  • Tries
    • 1.Sc1?
      • threat
        • 2.Sa2#
      • 1...a2
        • 2.Sxa2#
      • 1...Sd2!
    • 1.Qe1+?
      • 1...Kc2
        • 2.Qc1#
      • 1...Sd2
        • 2.Qxd2#
        • 2.Qc1#
      • 1...Kb2!
  • Keys
    • 1.Sa1!
      • threat
        • 2.Qc2#
      • 1...Qxg7
        • 2.d4#
      • 1...Sd2
        • 2.Qxd4#
      • 1...Qe5
        • 2.Be6#
      • 1...Qf6
        • 2.Bd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(e);N_PINB(F)::R(H)+B(F)
    • Q(e);N_PINB(F),N_SPINQ(e),OGATE,XB(G)::R(D)+P(C)
    • S(a);N_GUARD::QAB1(A),XS(a)
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • P(c);::S(B),XP(c)
      • Refutation
        • S(a);
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);N_SPINQ(e),P-FLIGHT::QAR1(A)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • S(B);
    • Threat
      • QAR1(A)
    • Vars
      • Q(e);N_PINB(F),N_SPINQ(e),OGATE,XB(G)::R(D)+P(C)
      • S(a);SBLOCK::QAB1(A),XQ(e)
      • Q(e);N_PINB(F)::R(H)+B(F)
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