MESON Chess Problem Database

Problem Display
PID: 197446 (8/8/2N5/5Q2/1pk5/8/1KnP4/nNRr4 w - - 0 1)

Way, Charles F

The Observer, 1944

(First published on Sun Jan 9 1944)

8/8/2N5/5Q2/1pk5/8/1KnP4/nNRr4

#2

6 + 5

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc1
      • 2.d3#
    • 1...Re1
      • 2.d3#
    • 1...Rf1
      • 2.d3#
    • 1...Rg1
      • 2.d3#
    • 1...Rh1
      • 2.d3#
    • 1...Rxd2
      • 2.Sxd2#
    • 1...Sb3
      • 2.Rxc2#
    • 1...b3
      • 2.Sa3#
  • Tries
    • 1.Sc3?
      • threat
        • 2.Qb5#
        • 2.Qd5#
      • 1...Rxd2
        • 2.Qb5#
      • 1...Sa3
        • 2.Qd5#
      • 1...Se3
        • 2.Qb5#
      • 1...Sd4
        • 2.Sa5#
      • 1...bxc3+!
  • Keys
    • 1.d4!
      • 1...Rxc1
        • 2.Sd2#
      • 1...Rxd4
        • 2.Sa5#
      • 1...Re1
        • 2.Sd2#
      • 1...Rf1
        • 2.Sd2#
      • 1...Rg1
        • 2.Sd2#
      • 1...Rh1
        • 2.Sd2#
      • 1...Rd2
        • 2.Sxd2#
      • 1...Rd3
        • 2.Qc5#
      • 1...Sb3
        • 2.Rxc2#
      • 1...b3
        • 2.Sa3#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 5
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(b);N_GUARD,N_SPINS(c),XR(B)::P(D)
    • R(b);N_GUARD::P(D)
    • R(b);XP(D)::S(A),XR(b)
    • S(a);N_GUARD::R(B),XS(c)
    • P(d);N_GUARD::S(A)
  • Tries
    • Try
      • S(A);N_PINS(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(b);XP(D)::QAB1(E)
        • S(c);::QAB1(E)
        • S(c);SBLOCK::S(F)
      • Refutation
        • P(d);CHECK,XS(A)
  • Actual
    • P(D);
    • Vars
      • R(b);N_GUARD,N_SPINS(c),XR(B)::S(A)
      • R(b);SBLOCK,XP(D)::S(F)
      • R(b);N_GUARD::S(A)
      • R(b);N_GUARD::S(A),XR(b)
      • R(b);SBLOCK::QAR1(E)
      • S(a);N_GUARD::R(B),XS(c)
      • P(d);N_GUARD::S(A)
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