MESON Chess Problem Database

Problem Display
PID: 185044 (3R2B1/b1pq1n2/r5b1/1Pnk1NQ1/4p3/1N1prPBK/8/2R5 w - - 0 1)

Stewart, John

The Observer, 1930

(First published on Sun Feb 2 1930)

3R2B1/b1pq1n2/r5b1/1Pnk1NQ1/4p3/1N1prPBK/8/2R5

#2

10 + 11

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Sg7#
    • 1...Re6
      • 2.Sxe3#
      • 2.Se7#
    • 1...Bxf5+
      • 2.Qxf5#
    • 1...Se6
      • 2.Sxe3#
      • 2.Se7#
  • Tries
    • 1.Bxf7+?
      • 1...Re6
        • 2.Sxe3#
        • 2.Se7#
      • 1...Se6
        • 2.Sxe3#
        • 2.Se7#
      • 1...Bxf7!
    • 1.Rxc5+?
      • 1...Ke6
        • 2.Sg7#
        • 2.Re5#
        • 2.Qxg6#
      • 1...Bxc5!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Qe5#
      • 1...Bxf5+
        • 2.Qxf5#
      • 1...Ke6
        • 2.Qe5#
      • 1...exf3
        • 2.Qc4#
      • 1...Re6
        • 2.Sxe3#
      • 1...Se6
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(e);N_PINS(G),N_SPINQ(j),S_FLIGHT::S(G)
    • B(g);CHECK,OGATE,P_SPINB(g),XS(G)::QAR2(H),XB(g)
  • Tries
    • Try
      • B(J);CHECK,XS(k)
      • Refutation
        • B(g);XB(J)
    • Try
      • R(A);CHECK,XS(d)
      • Refutation
        • B(h);XR(A)
  • Actual
    • Q(H);
    • Threat
      • QAR1(H)
    • Vars
      • B(g);CHECK,OGATE,XS(G)::QAR2(H),XB(g)
      • K(e);N_PINS(G),N_SPINQ(j),S_FLIGHT::QAR1(H)
      • P(c);OGATE,XP(C)::QAB1(H)
      • R(f);N_PINS(G),N_SPINS(k),SBLOCK::S(G),XR(b)
      • S(d);N_PINS(G),N_SPINS(k),SBLOCK::S(G)
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