MESON Chess Problem Database

Problem Display
PID: 188531 (8/3p3Q/7n/6B1/Kn2Pq2/4kN2/2B1P3/N3RR2 w - - 0 1)

Wynne, RL

The Observer, 1937

(First published on Sun Oct 3 1937)

8/3p3Q/7n/6B1/Kn2Pq2/4kN2/2B1P3/N3RR2

#2

10 + 5

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc2
      • 2.Sxc2#
    • 1...Sd3
      • 2.exd3#
    • 1...d6
      • 2.Qa7#
  • Tries
    • 1.Qxd7?
      • threat
        • 2.Qd2#
        • 2.Qd4#
        • 2.Qa7#
      • 1...Qxg5
        • 2.Qd2#
      • 1...Sxc2
        • 2.Qd3#
      • 1...Sd3
        • 2.Qxd3#
        • 2.Qd4#
        • 2.exd3#
      • 1...Sa6
        • 2.Qd2#
        • 2.Qd3#
        • 2.Qd4#
      • 1...Sc6
        • 2.Qd2#
        • 2.Qd3#
      • 1...Sf5
        • 2.Qd2#
      • 1...Sd5!
  • Keys
    • 1.Qe7!
      • threat
        • 2.Qc5#
      • 1...Qxg5
        • 2.Qxg5#
      • 1...Sxc2
        • 2.Sxc2#
      • 1...Sd3
        • 2.exd3#
      • 1...Sa6
        • 2.Qa3#
      • 1...Sc6
        • 2.Qa3#
      • 1...Sf5
        • 2.exf5#
      • 1...d5
        • 2.exd5#
      • 1...d6
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(b);P_PINP(H),XB(D)::S(A),XS(b)
    • S(b);OGATE,P_PINP(H)::R(B)+P(E),XS(b)
    • P(e);OGATE::QAB(J)
  • Tries
    • Try
      • Q(J);XP(e)
      • Threat
        • DUALS(3)
      • Vars
        • Q(c);N_SPINQ(c),XB(I)::QAB1(J)
        • S(b);N_GUARD,P_PINP(H),XB(D)::QAR1(J)
        • S(d);::QAB1(J)
      • Refutation
        • S(b);P_PINP(H)
  • Actual
    • Q(J);
    • Threat
      • QAB(J)
    • Vars
      • Q(c);N_SPINQ(c),OGATE,XB(I)::QAB(J),XQ(c)
      • S(b);P_PINP(H),XB(D)::S(A),XS(b)
      • S(b);OGATE,P_PINP(H)::R(B)+P(E),XS(b)
      • S(b);OGATE,P_PINP(H)::QAR(J)
      • S(d);OGATE::QAR(J)+P(H),XS(d)
      • P(e);OGATE::QAR(J)+P(H),XP(e)
      • P(e);OGATE::QAB(J)
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