MESON Chess Problem Database

Problem Display
PID: 269979 (Q7/1B6/1Kn2R2/2prp1P1/2Npkp2/3pq3/4n1P1/2B1R3 w - - 0 1)

Stevenson, Edward

The Observer, 1958

(First published on Sun Aug 17 1958)

Q7/1B6/1Kn2R2/2prp1P1/2Npkp2/3pq3/4n1P1/2B1R3

#2

9 + 10

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc1
      • 2.Sd2#
    • 1...Sg1
      • 2.Sd2#
    • 1...Sc3
      • 2.Sd2#
    • 1...Sg3
      • 2.Sd2#
    • 1...Sb4
      • 2.Sd6#
    • 1...Sa5
      • 2.Sd6#
      • 2.Bxd5#
    • 1...Sa7
      • 2.Sd6#
      • 2.Bxd5#
    • 1...Se7
      • 2.Sd6#
    • 1...Sb8
      • 2.Sd6#
      • 2.Bxd5#
    • 1...Sd8
      • 2.Sd6#
      • 2.Bxd5#
  • Tries
    • 1.Bxc6?
      • threat
        • 2.Sd6#
        • 2.Bxd5#
      • 1...Qxc1
        • 2.Bxd5#
      • 1...Qd2
        • 2.Bxd5#
      • 1...Sc3
        • 2.Sd2#
        • 2.Sd6#
      • 1...d2!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qg6#
      • 1...Rd6
        • 2.Qxe5#
      • 1...Rd7
        • 2.Qxe5#
      • 1...Rd8
        • 2.Qxe5#
      • 1...Qh3
        • 2.Rxf4#
      • 1...Sg3
        • 2.Sd2#
      • 1...Se7
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • S(a);P_SPINQ(c),XB(A)::S(D)
    • S(a);P_SPINQ(c)::S(D)
    • S(j);P_SPINR(h)::S(D)
  • Tries
    • Try
      • B(H);P_PINR(h),XS(j)
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);P_SPINS(a),XB(A)::B(H),XR(h)
        • Q(c);P_SPINS(a)::B(H),XR(h)
      • Refutation
        • P(b);
  • Actual
    • Q(I);P_PINP(i)
    • Threat
      • QAB(I)
    • Vars
      • R(h);N_GUARD,P_SPINS(j)::QAR1(I),XP(i)
      • Q(c);N_GUARD,P_SPINS(a)::R1(G),XP(f)
      • S(a);P_SPINQ(c)::S(D)
      • S(j);N_SPINP(i),P_SPINR(h)::S(D)
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