MESON Chess Problem Database

Problem Display
PID: 20932 (bb6/5B2/3n4/5k2/r5N1/1N4nK/2R5/2BQq3 w - - 0 1)

Guidelli, Giorgio

Good Companions (December), 1914

bb6/5B2/3n4/5k2/r5N1/1N4nK/2R5/2BQq3

#2

7 + 7

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Sge4
      • 2.Qf3#
    • 1...Sde4
      • 2.Qd7#
  • Tries
    • 1.Rc5+?
      • 1...Ke4
        • 2.Sf6#
        • 2.Re5#
      • 1...Qe5
        • 2.Rxe5#
      • 1...Bd5!
    • 1.Qf3+?
      • 1...Rf4
        • 2.Qxf4#
      • 1...Bxf3!
    • 1.Qd5+?
      • 1...Qe5
        • 2.Qxe5#
      • 1...Bxd5!
  • Keys
    • 1.Qd3+!
      • 1...Qe4
        • 2.Rf2#
      • 1...Re4
        • 2.Sd4#
      • 1...Be4
        • 2.Rc5#
      • 1...Sge4
        • 2.Qf3#
      • 1...Sde4
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(b);S_CUTB(f),S_CUTR(c)::QAR2(B)
    • S(e);OGATE,SBLOCK::QAB(B)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::R1(C),XQ(a)
      • Refutation
        • B(f);P_SPINB(f)
    • Try
      • Q(B);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAR1(B),XR(c)
      • Refutation
        • B(f);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAR1(B),XQ(a)
      • Refutation
        • B(f);XQ(B)
  • Actual
    • Q(B);CHECK
    • Vars
      • Q(a);P_SPINQ(a)::R(C)
      • R(c);P_SPINR(c)::S(D)
      • B(f);P_SPINB(f)::R(C)
      • S(b);P_SPINS(b),S_CUTB(f),S_CUTR(c)::QAR2(B)
      • S(e);OGATE,P_SPINS(e),SBLOCK::QAB(B)
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