MESON Chess Problem Database

Problem Display
PID: 325 (N3r3/3b4/R2Bn3/2pk4/1PpP3R/1qb2P1N/1rn1P2K/1B5Q w - - 0 1)

Andrade, Barry Jack da Costa

Harley, Brian

The Observer, 1924

(First published on Sun Jun 15 1924)

N3r3/3b4/R2Bn3/2pk4/1PpP3R/1qb2P1N/1rn1P2K/1B5Q

#2

12 + 10

887 Mate in Two Moves 1931
15290 Harley Scrapbook 2014
56 The Problemist 2015
15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd4
      • 2.e4#
    • 1...Scxd4
      • 2.Be4#
    • 1...Sexd4
      • 2.Sf4#
      • 2.Sc7#
    • 1...Sg5
      • 2.Sc7#
    • 1...Sc7
      • 2.Sxc7#
    • 1...Sg7
      • 2.Sc7#
    • 1...Sd8
      • 2.Sc7#
    • 1...Sf8
      • 2.Sc7#
    • 1...cxd4
      • 2.f4#
  • Tries
    • 1.Bg3?
      • threat
        • 2.Rd6#
      • 1...Bc6
        • 2.Sb6#
      • 1...Sf4!
    • 1.Bb8?
      • threat
        • 2.Rd6#
      • 1...Bxd4
        • 2.e4#
      • 1...Scxd4
        • 2.Be4#
      • 1...Sexd4
        • 2.Sf4#
      • 1...cxd4
        • 2.f4#
      • 1...Bc6
        • 2.Sb6#
      • 1...Sc7
        • 2.Sxc7#
      • 1...Rxb8!
  • Keys
    • 1.Bc7!
      • threat
        • 2.Rd6#
      • 1...Bxd4
        • 2.e4#
      • 1...Scxd4
        • 2.Be4#
      • 1...Sexd4
        • 2.Sf4#
      • 1...Sxc7
        • 2.Sxc7#
      • 1...cxd4
        • 2.f4#
      • 1...Bc6
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • B(d);SBLOCK,XP(H)::P(C)
    • S(b);OGATE,P_PINP(C),SBLOCK,XP(H)::B(A)
    • S(h);N_GUARD::S(L)
    • S(h);N_GUARD::S(L),XS(h)
    • P(f);SBLOCK,XP(H)::QAB(B)+P(E)
  • Tries
    • Try
      • B(K);
      • Threat
        • R1(J)
      • Vars
        • B(i);SBLOCK::S(L)
      • Refutation
        • S(h);
    • Try
      • B(K);
      • Threat
        • R1(J)
      • Vars
        • B(d);SBLOCK,XP(H)::P(C)
        • S(b);OGATE,P_PINP(C),SBLOCK,XP(H)::B(A)
        • S(h);N_GUARD,SBLOCK,XP(H)::S(F)
        • P(f);SBLOCK,XP(H)::QAB(B)+P(E)
        • B(i);SBLOCK::S(L)
        • S(h);N_GUARD::S(L),XS(h)
      • Refutation
        • R(j);XB(K)
  • Actual
    • B(K);
    • Threat
      • R1(J)
    • Vars
      • B(d);SBLOCK,XP(H)::P(C)
      • S(b);OGATE,P_PINP(C),SBLOCK,XP(H)::B(A)
      • S(h);N_GUARD,SBLOCK,XP(H)::S(F)
      • S(h);XB(K)::S(L),XS(h)
      • P(f);SBLOCK,XP(H)::QAB(B)+P(E)
      • B(i);SBLOCK::S(L)
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