MESON Chess Problem Database

Problem Display
PID: 318 (KBr1nR2/P1pkPR1n/Q1N2pp1/1N3prb/1PP2Pp1/6P1/8/8 w - - 0 1)

Andrade, Barry Jack da Costa

Watney, Charles Gold

The Observer, 1923

(First published on Sun Apr 1 1923)

KBr1nR2/P1pkPR1n/Q1N2pp1/1N3prb/1PP2Pp1/6P1/8/8

#2

13 + 11

887 Mate in Two Moves 1931
56 The Problemist 2004
133 The Problemist Supplement 2004
15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Qxc8#
    • 1...Rxb8+
      • 2.Sxb8#
    • 1...Rd8
      • 2.exd8S#
    • 1...Sxf8
      • 2.exf8S#
    • 1...Sd6
      • 2.e8Q#
    • 1...Sg7
      • 2.e8Q#
      • 2.e8R#
  • Tries
    • 1.Scd4?
      • threat
        • 2.Qc6#
        • 2.Qe6#
      • 1...Rxb8+
        • 2.axb8S#
      • 1...Sxf8
        • 2.Qc6#
      • 1...Rd8
        • 2.Qe6#
      • 1...Sd6
        • 2.Qc6#
        • 2.e8Q#
      • 1...Sg7
        • 2.Qxc8#
        • 2.Qc6#
        • 2.e8Q#
        • 2.e8R#
      • 1...c5
        • 2.Qe6#
      • 1...c6!
    • 1.Rg8?
      • 1...Rxb8+
        • 2.Sxb8#
      • 1...Rd8
        • 2.exd8S#
      • 1...Sf8
        • 2.exf8S#
      • 1...Sd6
        • 2.e8Q#
      • 1...Sg7
        • 2.e8Q#
        • 2.e8R#
      • 1...Ke6!
    • 1.Rh8?
      • 1...Rxb8+
        • 2.Sxb8#
      • 1...Rd8
        • 2.exd8S#
      • 1...Sf8
        • 2.exf8S#
      • 1...Sd6
        • 2.e8Q#
      • 1...Sg7
        • 2.e8Q#
        • 2.e8R#
      • 1...Ke6!
    • 1.Qb7?
      • 1...Ke6
        • 2.Qxc8#
      • 1...Sxf8
        • 2.exf8S#
      • 1...Rd8
        • 2.exd8S#
      • 1...Sd6
        • 2.e8Q#
      • 1...Sg7
        • 2.e8Q#
        • 2.e8R#
      • 1...Rxb8+!
    • 1.c5?
      • 1...Rxb8+
        • 2.Sxb8#
      • 1...Sxf8
        • 2.exf8S#
      • 1...Rd8
        • 2.exd8S#
      • 1...Sd6
        • 2.e8Q#
      • 1...Sg7
        • 2.e8Q#
        • 2.e8R#
      • 1...Ke6!
  • Keys
    • 1.Sbd4!
      • 1...Rxb8+
        • 2.Sxb8#
      • 1...Kd6
        • 2.Se5#
      • 1...Sxf8
        • 2.exf8Q#
        • 2.exf8B#
      • 1...Rd8
        • 2.exd8Q#
        • 2.exd8R#
      • 1...Sd6
        • 2.e8Q#
        • 2.e8B#
      • 1...Sg7
        • 2.e8S#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • K(h);S_FLIGHT::QAB(F),XR(j)
    • R(j);CHECK,XB(L)::S(G),XR(j)
    • R(j);OGATE::PXR(j)=S
    • S(i);OGATE,XR(M)::PXS(i)=S
    • S(k);OGATE::P=Q
  • Tries
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • R(j);CHECK,OGATE,XB(L)::PXR(j)=S
        • S(i);XR(M)::QAB1(F)
        • R(j);::QAB1(F)
        • P(g);::QAB1(F)
      • Refutation
        • P(g);
    • Try
      • R(M);
      • Vars
        • R(j);CHECK,XB(L)::S(G),XR(j)
        • R(j);OGATE::PXR(j)=S
        • S(i);OGATE::PXS(i)=S
        • S(k);OGATE::P=Q
      • Refutation
        • K(h);S_FLIGHT
    • Try
      • R(M);
      • Vars
        • R(j);CHECK,XB(L)::S(G),XR(j)
        • R(j);OGATE::PXR(j)=S
        • S(i);OGATE::PXS(i)=S
        • S(k);OGATE::P=Q
      • Refutation
        • K(h);S_FLIGHT
    • Try
      • Q(F);P_PINP(g)
      • Vars
        • K(h);N_SPINP(g),S_FLIGHT::QAB(F),XR(j)
        • S(i);OGATE,XR(M)::PXS(i)=S
        • R(j);OGATE::PXR(j)=S
        • S(k);OGATE::P=Q
      • Refutation
        • R(j);CHECK,XB(L)
    • Try
      • P(C);
      • Vars
        • R(j);CHECK,XB(L)::S(G),XR(j)
        • S(i);OGATE,XR(M)::PXS(i)=S
        • R(j);OGATE::PXR(j)=S
        • S(k);OGATE::P=Q
      • Refutation
        • K(h);S_FLIGHT
  • Actual
    • S(E);
    • Vars
      • R(j);CHECK,XB(L)::S(G),XR(j)
      • K(h);P-FLIGHT,P_SPINP(g)::QAR(F)+S(G)
      • S(i);OGATE,XR(M)::PXS(i)=Q
      • R(j);OGATE::PXR(j)=Q
      • S(k);OGATE,SBLOCK::P=Q
      • S(k);OGATE::P=S
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