MESON Chess Problem Database

Problem Display
PID: 65310 (8/6Q1/8/8/KB6/3B3p/3R1P1q/2r1k1n1 w - - 0 1)

Guidelli, Giorgio

Good Companions (August), 1921

8/6Q1/8/8/KB6/3B3p/3R1P1q/2r1k1n1

#2

6 + 5

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Qxg1#
    • 1...Qe5
      • 2.Qxg1#
    • 1...Qd6
      • 2.Qxg1#
    • 1...Qc7
      • 2.Qxg1#
    • 1...Qb8
      • 2.Qxg1#
    • 1...Ra1+
      • 2.Qxa1#
  • Tries
    • 1.Re2+?
      • 1...Kd1
        • 2.Re1#
      • 1...Kf1!
    • 1.Qe5+?
      • 1...Se2
        • 2.Qxe2#
      • 1...Qxe5!
    • 1.Qe7+?
      • 1...Se2
        • 2.Qxe2#
      • 1...Qe5!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Rc2#
      • 1...Ra1+
        • 2.Ra2#
      • 1...Qxf2
        • 2.Rd1#
      • 1...Rc3
        • 2.Qd1#
      • 1...Se2
        • 2.Qxe2#
      • 1...Qf4
        • 2.Qxg1#
      • 1...Qe5
        • 2.Qxg1#
      • 1...Qd6
        • 2.Qxg1#
      • 1...Qc7
        • 2.Qxg1#
      • 1...Qb8
        • 2.Qxg1#
      • 1...Rb1
        • 2.Rb2#
      • 1...Rd1
        • 2.Qxd1#
      • 1...Rc2
        • 2.Rxc2#
        • 2.Qd1#
      • 1...Rc4
        • 2.Qd1#
      • 1...Rc5
        • 2.Qd1#
      • 1...Rc6
        • 2.Qd1#
      • 1...Rc7
        • 2.Qd1#
      • 1...Rc8
        • 2.Qd1#
      • 1...Sf3
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 11
    • REMOVED MATES = 0
  • Sets
    • Q(d);N_GUARD,P_PINB(E)::QAR2(F),XS(c)
    • Q(d);N_GUARD::QAR2(F),XS(c)
    • R(a);CHECK,OGATEB::QAR(F),XR(a)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(b);P-FLIGHT::R1(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAR1(F),XS(c)
      • Refutation
        • Q(d);XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAR1(F),XS(c)
      • Refutation
        • Q(d);P_SPINQ(d)
  • Actual
    • Q(F);
    • Threat
      • B(E)+R(A)
    • Vars
      • R(a);CHECK,N_GUARD::B(E)+R(A)
      • Q(d);SBLOCK,XP(B)::B(E)+R(A),DCHECK
      • R(a);N_GUARD::QAR1(F)
      • S(c);N_GUARD::QAR1(F),XS(c)
      • Q(d);N_GUARD,P_PINB(E)::QAR2(F),XS(c)
      • Q(d);N_GUARD::QAR2(F),XS(c)
      • R(a);N_GUARD::B(E)+R(A)
      • R(a);N_GUARD::QAR1(F),XR(a)
      • R(a);N_GUARD,P_PINB(E)::QAR1(F)
      • S(c);N_GUARD::QAR(F)
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