MESON Chess Problem Database

Problem Display
PID: 175515 (2N1n3/6pq/1B6/4kPQ1/2P2Rp1/8/1b6/1K2n3 w - - 0 1)

McAllister, George W

Philadelphia Times, 1899

2N1n3/6pq/1B6/4kPQ1/2P2Rp1/8/1b6/1K2n3

#2

7 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf5+
      • 2.Qxf5#
    • 1...Bc1
      • 2.Bd4#
    • 1...Ba3
      • 2.Bd4#
    • 1...Bd4
      • 2.Bxd4#
    • 1...Sf6
      • 2.Bc7#
    • 1...Sc7
      • 2.Bxc7#
  • Tries
    • 1.Bc7+?
      • 1...Sd6
        • 2.Bxd6#
      • 1...Sxc7!
  • Keys
    • 1.Rf2!
      • threat
        • 2.Re2#
        • 2.Qe7#
      • 1...Qxf5+
        • 2.Qxf5#
      • 1...Ke4
        • 2.Qe3#
      • 1...Qg6
        • 2.Re2#
      • 1...Qg8
        • 2.Re2#
      • 1...Qh1
        • 2.Qe7#
      • 1...Qh2
        • 2.Qe7#
      • 1...Qh3
        • 2.Qe7#
      • 1...Qh4
        • 2.Re2#
      • 1...Qh6
        • 2.Re2#
      • 1...Bc1
        • 2.Qe7#
      • 1...Ba3
        • 2.Re2#
      • 1...Bd4
        • 2.Qe7#
      • 1...Sc2
        • 2.Qe7#
      • 1...Sg2
        • 2.Qe7#
      • 1...Sf3
        • 2.Re2#
      • 1...Sd6
        • 2.Qe7#
      • 1...Sf6
        • 2.Qf4#
      • 1...Sc7
        • 2.Re2#
      • 1...g6
        • 2.Re2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 13
    • REMOVED MATES = 0
  • Sets
    • Q(f);CHECK,OGATE,P_SPINQ(f),XP(D)::QAR1(E),XQ(f)
    • B(b);N_GUARD::B(F)
    • B(b);N_GUARD::B(F),XB(b)
    • S(g);N_GUARD::B(F)
    • S(g);N_GUARD::B(F),XS(g)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::B(F),XS(g)
      • Refutation
        • S(g);XB(F)
  • Actual
    • R(C);
    • Threat
      • DUALS(2)
    • Vars
      • Q(f);CHECK,OGATE,P_SPINQ(f),XP(D)::QAR1(E),XQ(f)
      • K(d);N_PINP(D),P-FLIGHT::QAR1(E)
      • Q(f);::R(C)
      • Q(f);N_PINP(D)::R(C)
      • Q(f);N_PINP(D)::QAR2(E)
      • B(b);::QAR2(E)
      • B(b);::R(C)
      • S(a);N_PINP(D)::QAR2(E)
      • S(a);::QAR2(E)
      • S(a);::R(C)
      • S(g);::QAR2(E)
      • S(g);SBLOCK::QAB1(E)
      • S(g);::R(C)
      • P(e);N_PINP(D)::R(C)
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