MESON Chess Problem Database

Problem Display
PID: 101101 (2Q5/N7/4B3/q1B2K2/1p1P1N2/r1k5/rR5R/n7 w - - 0 1)

Melhuish, George W

Good Companions, 1919

2Q5/N7/4B3/q1B2K2/1p1P1N2/r1k5/rR5R/n7

#2

9 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qb6
      • 2.Bxb6#
    • 1...Qc7
      • 2.Sb5#
    • 1...Qd8
      • 2.Sb5#
    • 1...Qb5
      • 2.Sxb5#
    • 1...Qxc5+
      • 2.Qxc5#
    • 1...Qxa7
      • 2.Bxa7#
    • 1...Sc2
      • 2.Rhxc2#
    • 1...Sb3
      • 2.Rhc2#
  • Tries
    • 1.Se2+?
      • 1...Kd3
        • 2.Rh3#
      • 1...Kxb2!
    • 1.Rhd2?
      • threat
        • 2.Se2#
      • 1...Qxc5+
        • 2.Qxc5#
      • 1...Sc2
        • 2.Rdxc2#
      • 1...Qb5
        • 2.Sxb5#
      • 1...Qa6
        • 2.Bxb4#
      • 1...Rxb2!
    • 1.Qb7?
      • threat
        • 2.Qf3#
      • 1...Sc2
        • 2.Rhxc2#
      • 1...Qb5
        • 2.Sxb5#
      • 1...Qa6
        • 2.Qxb4#
      • 1...Qxc5+!
    • 1.Qc6?
      • threat
        • 2.Qf3#
      • 1...Qxc5+
        • 2.Qxc5#
      • 1...Sc2
        • 2.Rhxc2#
      • 1...Qb5
        • 2.Sxb5#
      • 1...Qa6!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Qh3#
      • 1...Qxc5+
        • 2.dxc5#
      • 1...Sc2
        • 2.Rhxc2#
      • 1...Qb5
        • 2.Sxb5#
      • 1...Qa6
        • 2.Bxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(f);N_PINB(E)::QAR(I)+B(E),XQ(f)
    • Q(f);N_GUARD,N_PINB(E)::S(H)
    • Q(f);N_GUARD::S(H),XQ(f)
    • Q(f);CHECK,OGATE,P_SPINQ(f),XB(E)::QAR2(I),XQ(f)
    • Q(f);N_PINB(E),XS(H)::QAR(I)+B(E),XQ(f)
    • S(a);N_GUARD::R1(B),XS(a)
    • S(a);N_GUARD::R1(B)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(d);P-FLIGHT::R(B)
      • Refutation
        • K(d);S_FLIGHT,XR(A)
    • Try
      • R(B);
      • Threat
        • S(D)
      • Vars
        • Q(f);CHECK,OGATE,P_SPINQ(f),XB(E)::QAR2(I),XQ(f)
        • S(a);N_GUARD::R1(B),XS(a)
        • Q(f);N_GUARD::S(H),XQ(f)
        • Q(f);N_PINB(E)::QAR(I)+B(E),DCHECK,XP(e)
      • Refutation
        • R(b);XR(A)
    • Try
      • Q(I);
      • Threat
        • QAR(I)
      • Vars
        • S(a);N_GUARD::R1(B),XS(a)
        • Q(f);N_GUARD::S(H),XQ(f)
        • Q(f);N_GUARD,N_PINB(E)::QAB1(I),XP(e)
      • Refutation
        • Q(f);CHECK,XB(E)
    • Try
      • Q(I);
      • Threat
        • QAR(I)
      • Vars
        • Q(f);CHECK,OGATE,P_SPINQ(f),XB(E)::QAR2(I),XQ(f)
        • S(a);N_GUARD::R1(B),XS(a)
        • Q(f);N_GUARD::S(H),XQ(f)
      • Refutation
        • Q(f);N_PINB(E)
  • Actual
    • Q(I);
    • Threat
      • QAR(I)
    • Vars
      • Q(f);CHECK,OGATE,XB(E)::QAB(I)+P(C),XQ(f)
      • S(a);N_GUARD::R1(B),XS(a)
      • Q(f);N_GUARD::S(H),XQ(f)
      • Q(f);N_PINB(E)::B(E),XP(e)
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