MESON Chess Problem Database

Problem Display
PID: 151818 (4Q2B/R5rP/3p4/2pk1N1n/4p3/2Kp3B/2n5/8 w - - 0 1)

McAllister, George W

Good Companions (January), 1915

4Q2B/R5rP/3p4/2pk1N1n/4p3/2Kp3B/2n5/8

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rg1
      • 2.Se7#
    • 1...Rg2
      • 2.Se7#
    • 1...Rg3
      • 2.Se7#
    • 1...Rg5
      • 2.Se7#
    • 1...Rg6
      • 2.Se7#
    • 1...Re7
      • 2.Sxe7#
    • 1...Rg8
      • 2.Se7#
      • 2.hxg8Q#
      • 2.hxg8B#
    • 1...Sa1
      • 2.Se3#
    • 1...Se1
      • 2.Se3#
    • 1...Sa3
      • 2.Se3#
    • 1...Se3
      • 2.Sxe3#
    • 1...Sb4
      • 2.Se3#
    • 1...Sd4
      • 2.Se3#
    • 1...c4
      • 2.Ra5#
  • Tries
    • 1.Ra6?
      • threat
        • 2.Rxd6#
      • 1...c4
        • 2.Ra5#
      • 1...Rg6
        • 2.Se7#
      • 1...Rd7!
    • 1.Qc6+?
      • 1...Ke5
        • 2.Qxd6#
      • 1...Ke6
        • 2.Qxd6#
      • 1...Kxc6!
  • Keys
    • 1.Re7!
      • threat
        • 2.Qa8#
      • 1...Rxe7
        • 2.Sxe7#
      • 1...c4
        • 2.Qb5#
      • 1...Rg8
        • 2.hxg8Q#
        • 2.hxg8B#
      • 1...Sb4
        • 2.Se3#
      • 1...Sd4
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 9
  • Sets
    • R(h);N_GUARD::S(C)
    • R(h);N_GUARD::S(C),XR(h)
    • S(a);N_GUARD::S(C)
    • S(a);N_GUARD::S(C),XS(a)
    • P(d);OGATEB::R(D)
  • Tries
    • Try
      • R(D);
      • Threat
        • R1(D),XP(g)
      • Vars
        • P(d);OGATEB::R(D)
        • R(h);N_GUARD::S(C)
      • Refutation
        • R(h);
    • Try
      • Q(F);CHECK
      • Vars
        • K(e);P-FLIGHT,P_SPINR(h)::QAB1(F),XP(g)
        • K(e);P_SPINP(g),S_FLIGHT::QAR1(F),XP(g)
      • Refutation
        • K(e);S_FLIGHT,XQ(F)
  • Actual
    • R(D);
    • Threat
      • QAB(F)
    • Vars
      • R(h);XR(D)::S(C),XR(h)
      • P(d);OGATEB::QAR2(F)
      • R(h);OGATE::PXR(h)=Q
      • S(a);N_GUARD::S(C)
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