MESON Chess Problem Database

Problem Display
PID: 224494 (r1nn4/p5Q1/8/2kN4/Rb1N4/2p5/B1P4B/1K6 w - - 0 1)

Johne, Gustav

The Westminster Papers, 1873

r1nn4/p5Q1/8/2kN4/Rb1N4/2p5/B1P4B/1K6

#2

8 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ba3
      • 2.Ra5#
    • 1...Ba5
      • 2.Rxa5#
  • Tries
    • 1.Sb6?
      • threat
        • 2.Sd7#
      • 1...Kxb6
        • 2.Qc7#
      • 1...axb6
        • 2.Qe5#
      • 1...Sxb6!
    • 1.Bd6+?
      • 1...Kxd6
        • 2.Qc7#
      • 1...Sxd6!
    • 1.Qc7+?
      • 1...Kxd4
        • 2.Rxb4#
        • 2.Qc4#
      • 1...Sc6!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Sd7#
      • 1...Kxd4
        • 2.Qg1#
      • 1...Kb6
        • 2.Qc7#
      • 1...Sb6
        • 2.Se4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(b);N_GUARD::R(E)
    • B(b);N_GUARD::R(E),XB(b)
  • Tries
    • Try
      • S(G);
      • Threat
        • S(G)
      • Vars
        • K(c);S_FLIGHT,XS(G)::QAB1(H)
        • P(d);SBLOCK,XS(G)::QAR2(H)
      • Refutation
        • S(f);XS(G)
    • Try
      • B(D);CHECK
      • Vars
        • K(c);S_FLIGHT,XB(D)::QAB1(H)
      • Refutation
        • S(f);XB(D)
    • Try
      • Q(H);CHECK
      • Refutation
        • S(g);P_SPINS(g)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • K(c);OGATEB,P_SPINB(b),S_FLIGHT,XS(F)::QAB(H)
      • K(c);S_FLIGHT::QAB1(H)
      • S(f);SBLOCK::S(G)
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