MESON Chess Problem Database

Problem Display
PID: 120693 (3B4/8/3pr3/N2p3p/N1Pk4/3p2P1/5P1K/3Q4 w - - 0 1)

Phelps, Francis Bradley

St. John Globe, 1888

3B4/8/3pr3/N2p3p/N1Pk4/3p2P1/5P1K/3Q4

#2

8 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Re4
      • 2.Qa1#
  • Tries
    • 1.Qf3?
      • threat
        • 2.Qxd5#
      • 1...Ke5
        • 2.Sc6#
        • 2.Qxd5#
        • 2.Qf4#
      • 1...dxc4
        • 2.Sc6#
      • 1...Re5
        • 2.Bb6#
      • 1...Re4!
    • 1.Qg4+?
      • 1...Ke5
        • 2.Sc6#
        • 2.Qf4#
      • 1...Re4
        • 2.Bf6#
      • 1...hxg4!
    • 1.Qxd3+?
      • 1...Ke5
        • 2.Sc6#
        • 2.Qxd5#
        • 2.f4#
      • 1...Kxd3!
  • Keys
    • 1.Qh1!
      • threat
        • 2.Qxd5#
      • 1...Ke5
        • 2.Qxd5#
      • 1...dxc4
        • 2.Sc6#
      • 1...Re5
        • 2.Bb6#
      • 1...Re4
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(f);SBLOCK::QAB(A)
  • Tries
    • Try
      • Q(A);N_PINP(a)
      • Threat
        • QAR1(A),XP(c)
      • Vars
        • P(c);SBLOCK,XP(F)::S(G)
        • R(f);SBLOCK::B(H)
      • Refutation
        • R(f);
    • Try
      • Q(A);CHECK,N_PINP(a)
      • Vars
        • R(f);P_SPINR(f)::B(H)
      • Refutation
        • P(d);XQ(A)
    • Try
      • Q(A);CHECK,XP(a)
      • Refutation
        • K(b);P-FLIGHT,XQ(A)
  • Actual
    • Q(A);N_PINP(a)
    • Threat
      • QAR1(A),XP(c)
    • Vars
      • K(b);S_FLIGHT::QAR1(A),XP(c)
      • P(c);SBLOCK,XP(F)::S(G)
      • R(f);SBLOCK::B(H)
      • R(f);SBLOCK::QAB(A)
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