MESON Chess Problem Database

Problem Display
PID: 163350 (4R3/3pN2b/3N1kpP/3K4/8/8/2p5/2B5 w - - 0 1)

Andrade, Barry Jack da Costa

The Observer, 1925

(First published on Sun May 3 1925)

4R3/3pN2b/3N1kpP/3K4/8/8/2p5/2B5

#2

6 + 5

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Bg8+
      • 2.Sxg8#
    • 1...g5
      • 2.Bb2#
  • Tries
    • 1.Kc5?
      • threat
        • 2.Sd5#
      • 1...Ke5
        • 2.Sd5#
        • 2.Sg8#
      • 1...Ke6
        • 2.Sd5#
        • 2.Sg8#
      • 1...Bg8
        • 2.Sxg8#
      • 1...g5!
    • 1.Ra8?
      • 1...Bg8+
        • 2.Sxg8#
      • 1...Kxe7
        • 2.Bg5#
      • 1...g5!
    • 1.Rb8?
      • 1...Bg8+
        • 2.Sxg8#
      • 1...Kxe7
        • 2.Bg5#
      • 1...g5!
    • 1.Rc8?
      • 1...Bg8+
        • 2.Sxg8#
      • 1...Kxe7
        • 2.Bg5#
      • 1...g5!
    • 1.Rd8?
      • 1...Bg8+
        • 2.Sxg8#
      • 1...Kxe7
        • 2.Bg5#
      • 1...g5!
    • 1.Rh8?
      • 1...Bg8+
        • 2.Sxg8#
      • 1...Kxe7
        • 2.Bg5#
      • 1...g5!
  • Keys
    • 1.Rg8!
      • 1...Bxg8+
        • 2.Sxg8#
      • 1...Kxe7
        • 2.Bg5#
      • 1...g5
        • 2.Bxg5#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • B(e);CHECK,N_GUARD::S(E),XB(e)
    • P(c);SBLOCK::B(A)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Threat
        • S(E)
      • Vars
        • B(e);N_GUARD::S(E),XB(e)
      • Refutation
        • P(c);
    • Try
      • R(F);
      • Vars
        • B(e);CHECK,N_GUARD::S(E),XB(e)
        • K(b);S_FLIGHT,XS(E)::B(A)
      • Refutation
        • P(c);
    • Try
      • R(F);
      • Vars
        • B(e);CHECK,N_GUARD::S(E),XB(e)
        • K(b);S_FLIGHT,XS(E)::B(A)
      • Refutation
        • P(c);
    • Try
      • R(F);
      • Vars
        • B(e);CHECK,N_GUARD::S(E),XB(e)
        • K(b);S_FLIGHT,XS(E)::B(A)
      • Refutation
        • P(c);
    • Try
      • R(F);
      • Vars
        • B(e);CHECK,N_GUARD::S(E),XB(e)
        • K(b);S_FLIGHT,XS(E)::B(A)
      • Refutation
        • P(c);
    • Try
      • R(F);
      • Vars
        • B(e);CHECK,N_GUARD::S(E),XB(e)
        • K(b);S_FLIGHT,XS(E)::B(A)
      • Refutation
        • P(c);
  • Actual
    • R(F);
    • Vars
      • B(e);CHECK,XR(F)::S(E),XB(e)
      • K(b);S_FLIGHT,XS(E)::B(A)
      • P(c);::B(A),XP(c)
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