MESON Chess Problem Database

Problem Display
PID: 51174 (8/Qpr5/8/n1p5/k3N3/p1K5/P7/5B2 w - - 0 1)

Oja, George A

Manchester Guardian, 1952

8/Qpr5/8/n1p5/k3N3/p1K5/P7/5B2

#2

5 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Rd7
      • 2.Sxc5#
    • 1...Re7
      • 2.Sxc5#
    • 1...Rf7
      • 2.Sxc5#
    • 1...Rg7
      • 2.Sxc5#
    • 1...Rh7
      • 2.Sxc5#
  • Tries
    • 1.Sd6?
      • threat
        • 2.Bb5#
      • 1...b5
        • 2.Bxb5#
      • 1...c4!
    • 1.Qb6?
      • threat
        • 2.Bb5#
        • 2.Qb5#
      • 1...c4
        • 2.Qb4#
      • 1...Sc4!
  • Keys
    • 1.Qxc5!
      • threat
        • 2.Bb5#
      • 1...Rxc5+
        • 2.Sxc5#
      • 1...Sb3
        • 2.axb3#
      • 1...Sc4
        • 2.Qb4#
      • 1...Sc6
        • 2.Qb5#
      • 1...b5
        • 2.Bxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • R(f);N_GUARD::S(D),XP(d)
  • Tries
    • Try
      • S(D);
      • Threat
        • B(A)
      • Vars
        • P(e);::B(A),XP(e)
      • Refutation
        • P(d);
    • Try
      • Q(E);N_PINS(c)
      • Threat
        • DUALS(2)
      • Vars
        • P(d);N_GUARD::QAR1(E)
      • Refutation
        • S(c);
  • Actual
    • Q(E);N_PINS(c),P_SPINQ(E),XP(d)
    • Threat
      • B(A)
    • Vars
      • R(f);CHECK,XQ(E)::S(D),XR(f)
      • S(c);OGATE::P(B),XS(c)
      • S(c);N_PINQ(E)::QAR1(E)
      • S(c);N_PINQ(E)::QAB1(E)
      • P(e);::B(A),XP(e)
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