MESON Chess Problem Database

Problem Display
PID: 331 (2BNqr2/4r1n1/6p1/Rb1kn1Q1/2R2pp1/BP6/6N1/5K2 w - - 0 1)

Harley, Brian

Howard, Kenneth Samuel

The Observer, 1925

(First published on Sun Aug 9 1925)

2BNqr2/4r1n1/6p1/Rb1kn1Q1/2R2pp1/BP6/6N1/5K2

#2

9 + 10

887 Mate in Two Moves 1931
5089 The Enjoyment of Chess Problems 1943
3098 FIDE Album (1914-1944) (I) 1971
15290 Harley Scrapbook 2014
56 The Problemist 2015
15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qf7
      • 2.Rxb5#
    • 1...Qxd8
      • 2.Rxb5#
    • 1...Rd7
      • 2.Rxb5#
    • 1...Rg8
      • 2.Sxf4#
    • 1...Rh8
      • 2.Sxf4#
    • 1...Sf5
      • 2.Sxf4#
    • 1...f3
      • 2.Se3#
  • Tries
    • 1.Bxg4?
      • threat
        • 2.Bf3#
      • 1...Qxd8
        • 2.Rxb5#
      • 1...Sf5
        • 2.Sxf4#
      • 1...f3
        • 2.Se3#
      • 1...Rf5!
    • 1.Bb7+?
      • 1...Qc6
        • 2.Bxc6#
        • 2.Rxb5#
      • 1...Rxb7!
    • 1.Qf5?
      • threat
        • 2.Sxf4#
        • 2.Qe4#
      • 1...Sxf5
        • 2.Sxf4#
      • 1...gxf5
        • 2.Sxf4#
      • 1...Sh5
        • 2.Qe4#
      • 1...Se6
        • 2.Qe4#
      • 1...f3
        • 2.Se3#
        • 2.Sf4#
        • 2.Qe4#
      • 1...g5
        • 2.Qe4#
      • 1...Rxf5!
  • Keys
    • 1.Qxf4!
      • threat
        • 2.Se3#
      • 1...Rxf4+
        • 2.Sxf4#
      • 1...Sxc4
        • 2.bxc4#
      • 1...Sd3
        • 2.Rd4#
      • 1...Sf3
        • 2.Qd6#
      • 1...Sc6
        • 2.Rxb5#
      • 1...Sd7
        • 2.Bb7#
      • 1...Sf7
        • 2.Qd4#
      • 1...Sf5
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 6
  • Sets
    • Q(i);N_GUARD::R(F),XB(c)
    • Q(i);N_GUARD,XS(I)::R(F),XB(c)
    • R(g);S_CUTQ(i)::R(F),XB(c)
    • R(j);N_GUARD::S(B),XP(a)
    • S(h);N_SPINS(e),S_CUTR(j)::S(B),XP(a)
    • P(a);N_GUARD::S(B)
  • Tries
    • Try
      • B(H);XP(b)
      • Threat
        • B(H)
      • Vars
        • Q(i);N_GUARD,XS(I)::R(F),XB(c)
        • S(h);N_SPINS(e),S_CUTR(j)::S(B),XP(a)
        • P(a);N_GUARD::S(B)
      • Refutation
        • R(j);N_SPINS(e)
    • Try
      • B(H);CHECK
      • Refutation
        • R(g);XB(H)
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • S(h);N_SPINS(e),XQ(G)::S(B),XP(a)
        • P(f);N_SPINS(e),XQ(G)::S(B),XP(a)
        • S(h);::QAB1(G)
        • P(f);::QAB1(G)
      • Refutation
        • R(j);N_SPINS(e),XQ(G)
  • Actual
    • Q(G);N_PINS(e),P_SPINQ(G),XP(a)
    • Threat
      • S(B)
    • Vars
      • R(j);CHECK,XQ(G)::S(B),XR(j)
      • S(e);OGATE,XR(E)::P(D),XS(e)
      • S(e);N_PINR(E)::R1(E)
      • S(e);N_PINQ(G)::QAR1(G)
      • S(e);S_CUTQ(i)::R(F),XB(c)
      • S(e);N_GUARD,S_CUTQ(i),S_CUTR(g)::B(H)
      • S(h);N_PINQ(G)::QAB1(G)
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