MESON Chess Problem Database

Problem Display
PID: 28305 (8/8/3N4/3pp3/6n1/3pk1P1/1Q4K1/1N6 w - - 0 1)

Penrose, Lionel Sharples

Reading Observer, 1916

8/8/3N4/3pp3/6n1/3pk1P1/1Q4K1/1N6

#2

5 + 5

3242 BCPS Rapid Solving (Cheltenham) 2001

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Qxf2#
    • 1...Sh2
      • 2.Qxe5#
      • 2.Qf2#
    • 1...Sf6
      • 2.Qf2#
    • 1...Sh6
      • 2.Qxe5#
      • 2.Qf2#
    • 1...d2
      • 2.Qxd2#
    • 1...d4
      • 2.Qd2#
    • 1...e4
      • 2.Sf5#
  • Tries
    • 1.Sa3?
      • 1...Sf2
        • 2.Qxf2#
      • 1...Sh2
        • 2.Qf2#
      • 1...Sf6
        • 2.Qf2#
      • 1...Sh6
        • 2.Qf2#
      • 1...d4
        • 2.Sac4#
      • 1...e4
        • 2.Sf5#
      • 1...d2!
    • 1.Qc1+?
      • 1...Ke2
        • 2.Sc3#
        • 2.Qd2#
      • 1...d2
        • 2.Qxd2#
      • 1...Kd4!
  • Keys
    • 1.Qa2!
      • 1...Kd4
        • 2.Qa7#
      • 1...d2
        • 2.Qxd2#
      • 1...Sf2
        • 2.Qxf2#
      • 1...Sh2
        • 2.Qf2#
      • 1...Sf6
        • 2.Qf2#
      • 1...Sh6
        • 2.Qf2#
      • 1...d4
        • 2.Qd2#
      • 1...e4
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAB1(B),XS(c)
    • S(c);N_GUARD::QAB1(B)
    • P(a);::QAB1(B),XP(a)
    • P(d);SBLOCK::QAB1(B)
    • P(e);SBLOCK::S(E)
  • Tries
    • Try
      • S(A);
      • Vars
        • S(c);N_GUARD::QAB1(B),XS(c)
        • S(c);N_GUARD::QAB1(B)
        • P(d);N_GUARD::S(A)
        • P(e);SBLOCK::S(E)
      • Refutation
        • P(a);
    • Try
      • Q(B);CHECK
      • Vars
        • P(a);P_SPINP(a)::QAB1(B),XP(a)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(b);S_FLIGHT::QAB(B)
      • P(a);::QAB1(B),XP(a)
      • S(c);N_GUARD::QAB1(B),XS(c)
      • S(c);N_GUARD::QAB1(B)
      • P(d);SBLOCK::QAB1(B)
      • P(e);SBLOCK::S(E)
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