MESON Chess Problem Database

Problem Display
PID: 184171 (4RB2/N1Rb4/rr5p/5p2/3kBP1N/1P2pQ2/1n1p4/6bK w - - 0 1)

Andrade, Barry Jack da Costa

The Observer, 1927

(First published on Sun Dec 11 1927)

4RB2/N1Rb4/rr5p/5p2/3kBP1N/1P2pQ2/1n1p4/6bK

#2

10 + 10

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rc6
      • 2.Sb5#
    • 1...Re6
      • 2.Sxf5#
    • 1...Ba4
      • 2.Sxf5#
    • 1...Bb5
      • 2.Sxf5#
    • 1...Be6
      • 2.Bg7#
    • 1...Bxe8
      • 2.Sxf5#
    • 1...Sd1
      • 2.Rc4#
    • 1...Sd3
      • 2.Rc4#
    • 1...Sa4
      • 2.Rc4#
    • 1...Sc4
      • 2.Rxc4#
    • 1...e2
      • 2.Bc5#
      • 2.Qc3#
    • 1...fxe4
      • 2.Qxe4#
  • Tries
    • 1.Sb5+?
      • 1...Bxb5
        • 2.Sxf5#
      • 1...Rxb5!
    • 1.Qxe3+?
      • 1...Bxe3
        • 2.Sf3#
      • 1...Kxe3!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Sf3#
      • 1...Bxe8
        • 2.Sxf5#
      • 1...fxe4
        • 2.Qxe4#
      • 1...Rc6
        • 2.Sb5#
      • 1...Bc6
        • 2.Qg7#
      • 1...Sc4
        • 2.Rxc4#
      • 1...e2
        • 2.Qxg1#
      • 1...d1Q
        • 2.Qxb2#
      • 1...d1B
        • 2.Qxb2#
      • 1...Re6
        • 2.Sxf5#
      • 1...Be6
        • 2.Bg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • R(h);N_GUARD,S_CUTB(j)::S(G)
    • R(h);S_CUTB(j)::S(F),XP(f)
    • B(j);N_GUARD::S(F),XP(f)
    • B(j);S_CUTR(h)::B(J)
    • B(j);N_GUARD,XR(I)::S(F),XP(f)
    • S(b);N_GUARD::R1(H)
    • S(b);N_GUARD::R1(H),XS(b)
    • P(f);OGATE,XB(D)::QAR1(C),XP(f)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • B(j);XS(G)::S(F),XP(f)
      • Refutation
        • R(h);XS(G)
    • Try
      • Q(C);CHECK,XP(d)
      • Vars
        • B(a);SBLOCK,XQ(C)::S(F)
      • Refutation
        • K(e);S_FLIGHT,XQ(C)
  • Actual
    • Q(C);
    • Threat
      • S(F)
    • Vars
      • B(j);N_GUARD,XR(I)::S(F),XP(f)
      • P(f);OGATE,XB(D)::QAR1(C),XP(f)
      • R(h);N_GUARD,S_CUTB(j)::S(G)
      • B(j);S_CUTR(h)::QAB(C)
      • S(b);N_GUARD::R1(H),XS(b)
      • P(d);OGATEB::QAB(C),XB(a)
      • P(c);OGATE::QAB(C),XS(b)
      • R(h);S_CUTB(j)::S(F),XP(f)
      • B(j);S_CUTR(h)::B(J)
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