MESON Chess Problem Database

Problem Display
PID: 258627 (8/2p5/4K3/P1k5/PnrN4/4P3/2N2p2/5Q2 w - - 0 1)

Williams, Philip Hamilton

English Mechanic and World of Science, 1902

(First published on Fri Mar 21 1902)

8/2p5/4K3/P1k5/PnrN4/4P3/2N2p2/5Q2

#2

7 + 5

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc2
      • 2.Qb5#
    • 1...Rc3
      • 2.Qb5#
    • 1...Rxd4
      • 2.Qb5#
    • 1...Sc6
      • 2.Sb3#
    • 1...c6
      • 2.Sb3#
  • Tries
    • 1.Sa3?
      • threat
        • 2.Qxc4#
      • 1...Rxd4
        • 2.Qb5#
      • 1...Rc1
        • 2.Qb5#
      • 1...Rc2
        • 2.Qb5#
      • 1...Rc3
        • 2.Qb5#
      • 1...Sd3!
  • Keys
    • 1.Se1!
      • 1...Rxd4
        • 2.Qb5#
      • 1...fxe1Q
        • 2.Qf8#
      • 1...fxe1S
        • 2.Qf8#
      • 1...fxe1B
        • 2.Qf8#
      • 1...fxe1R
        • 2.Qf8#
      • 1...Sa2
        • 2.Sd3#
      • 1...Sc2
        • 2.Sd3#
      • 1...Sd3
        • 2.Sxd3#
      • 1...Sd5
        • 2.Sd3#
      • 1...Sa6
        • 2.Sd3#
      • 1...Sc6
        • 2.Sd3#
      • 1...Rc1
        • 2.Qb5#
      • 1...Rc2
        • 2.Qb5#
      • 1...Rc3
        • 2.Qb5#
      • 1...c6
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • R(c);OGATE,XS(B)::QAR1(A)
    • R(c);OGATE::QAR1(A)
    • R(c);OGATE,XS(E)::QAR1(A)
    • S(b);SBLOCK::S(E)
    • P(e);SBLOCK::S(E)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAR1(A),XR(c)
      • Vars
        • R(c);OGATE,XS(E)::QAR1(A)
        • R(c);OGATE::QAR1(A)
      • Refutation
        • S(b);
  • Actual
    • S(B);
    • Vars
      • R(c);OGATE,XS(E)::QAR1(A)
      • P(a);OGATE,P_PINP(C),XS(B)::QAB(A)
      • P(a);OGATE,XS(B)::QAB(A)
      • S(b);N_GUARD::S(B)
      • S(b);N_GUARD::S(B),XS(b)
      • R(c);OGATE::QAR1(A)
      • P(e);SBLOCK::S(E)
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