MESON Chess Problem Database

Problem Display
PID: 186210 (b5n1/3Q1N1K/5p1B/2R5/r3k1N1/p6p/1pn4r/1qb2R2 w - - 0 1)

de Castro, B

The Observer, 1932

(First published on Sun Nov 27 1932)

b5n1/3Q1N1K/5p1B/2R5/r3k1N1/p6p/1pn4r/1qb2R2

#2

7 + 12

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rd2
      • 2.Rf4#
    • 1...Rd4
      • 2.Qf5#
    • 1...Bf4
      • 2.Rxf4#
    • 1...Bd5
      • 2.Qxd5#
    • 1...Se3
      • 2.Rf4#
    • 1...Sb4
      • 2.Rc4#
    • 1...Se7
      • 2.Sxf6#
    • 1...f5
      • 2.Re5#
  • Tries
    • 1.Sg5+?
      • 1...fxg5
        • 2.Re5#
      • 1...Bxg5!
    • 1.Rc4+?
      • 1...Sd4
        • 2.Qf5#
        • 2.Qxd4#
      • 1...Rxc4!
  • Keys
    • 1.Sge5!
      • threat
        • 2.Qd3#
      • 1...fxe5
        • 2.Rxe5#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Rd2
        • 2.Qg4#
      • 1...Rd4
        • 2.Qf5#
      • 1...Sa1
        • 2.Qxa4#
      • 1...Se1
        • 2.Qxa4#
      • 1...Se3
        • 2.Rf4#
      • 1...Sb4
        • 2.Rc4#
      • 1...Sd4
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • R(e);S_CUTB(b)::R1(A)
    • R(h);SBLOCK::QAB1(E)
    • B(b);N_GUARD::R1(A),XB(b)
    • B(k);N_GUARD::QAB1(E),XB(k)
    • S(d);S_CUTB(b)::R1(A)
    • S(d);N_GUARD,S_CUTR(h)::R(C)
    • S(l);N_GUARD::S(B),XP(j)
    • P(j);N_GUARD::R1(C)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • P(j);XS(F)::R1(C)
      • Refutation
        • B(b);XS(F)
    • Try
      • R(C);CHECK
      • Refutation
        • R(h);XR(C)
  • Actual
    • S(B);
    • Threat
      • QAB1(E)
    • Vars
      • P(j);OGATE,XS(B)::R1(C),XP(j)
      • B(k);N_GUARD::QAB1(E),XB(k)
      • R(e);S_CUTB(b)::QAR2(E)
      • R(h);SBLOCK::QAB1(E)
      • S(d);N_GUARD::QAR(E),XR(h)
      • S(d);SBLOCK,S_CUTB(b)::R1(A)
      • S(d);N_GUARD,S_CUTR(h)::R(C)
      • S(d);SBLOCK::S(F)
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