MESON Chess Problem Database

Problem Display
PID: 152988 (3Q1K2/2pNpnP1/R2Pkp2/2B1qn2/2N5/8/B7/3r1R2 w - - 0 1)

Harley, Brian

The Observer, 1935

(First published on Tue Jul 16 1935)

3Q1K2/2pNpnP1/R2Pkp2/2B1qn2/2N5/8/B7/3r1R2

#2

10 + 8

15290 Harley Scrapbook 2014
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Sd2#
    • 1...Qh2
      • 2.Sd2#
    • 1...Qxd6
      • 2.Sd2#
    • 1...Qe1
      • 2.Sd2#
    • 1...Re1
      • 2.Scxe5#
    • 1...Rxf1
      • 2.Scxe5#
    • 1...Rxd6
      • 2.Scxe5#
    • 1...Sxd6
      • 2.g8Q#
      • 2.g8B#
  • Tries
    • 1.Qxe7+?
      • 1...Kd5
        • 2.Sd2#
      • 1...Sxe7!
    • 1.dxc7+?
      • 1...Kd5
        • 2.Sd2#
        • 2.Sd6#
        • 2.Qa8#
      • 1...Qd6
        • 2.Sd2#
      • 1...Rd6
        • 2.Scxe5#
      • 1...S7d6
        • 2.g8Q#
        • 2.g8B#
      • 1...S5d6!
    • 1.g8Q?
      • threat
        • 2.Qxf7#
      • 1...Kd5
        • 2.Sd2#
      • 1...Sh6!
    • 1.g8B?
      • threat
        • 2.Bxf7#
      • 1...Kd5
        • 2.Sd2#
      • 1...Sh6!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Sdb6#
      • 1...Kd5
        • 2.Sd2#
      • 1...Qxd6
        • 2.Sd2#
      • 1...Rxd6
        • 2.Scxe5#
      • 1...S5xd6
        • 2.Sxf6#
      • 1...S7xd6
        • 2.g8Q#
        • 2.g8B#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • K(d);S_FLIGHT::B(B)+S(C)
    • Q(b);N_GUARD::B(B)+S(C)
    • Q(b);N_GUARD,P_SPINQ(b),XP(F)::B(B)+S(C)
    • R(a);N_GUARD::B(B)+S(C),XQ(b)
    • R(a);N_GUARD,XR(A)::B(B)+S(C),XQ(b)
    • R(a);N_GUARD,P_SPINR(a),XP(F)::B(B)+S(C),XQ(b)
    • S(h);P_SPINS(h),XP(F)::P=Q
  • Tries
    • Try
      • Q(I);CHECK,XP(g)
      • Vars
        • K(d);S_FLIGHT::B(B)+S(C)
      • Refutation
        • S(c);XQ(I)
    • Try
      • P(F);CHECK,XP(f)
      • Vars
        • Q(b);P_SPINQ(b)::B(B)+S(C)
        • R(a);P_SPINR(a)::B(B)+S(C),XQ(b)
        • S(h);P_SPINS(h),S_CUTQ(b),S_CUTR(a),S_CUTS(c)::P=Q
      • Refutation
        • S(c);P_SPINS(c)
    • Try
      • P(H);P_PINS(h)
      • Threat
        • QAB1(H),XS(h)
      • Vars
        • K(d);S_FLIGHT::B(B)+S(C)
      • Refutation
        • S(c);
    • Try
      • P(H);P_PINS(h)
      • Threat
        • B(H),XS(h)
      • Vars
        • K(d);S_FLIGHT::B(B)+S(C)
      • Refutation
        • S(c);
  • Actual
    • Q(I);
    • Threat
      • QAB(I)+S(G)
    • Vars
      • K(d);S_FLIGHT::B(B)+S(C)
      • Q(b);N_GUARD,P_SPINQ(b),XP(F)::B(B)+S(C)
      • R(a);N_GUARD,P_SPINR(a),XP(F)::B(B)+S(C),XQ(b)
      • S(c);P_SPINS(c),XP(F)::QAB(I)+S(G),XP(e)
      • S(h);P_SPINS(h),XP(F)::P=Q
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