MESON Chess Problem Database

Problem Display
PID: 109053 (1BKNN1Qn/5p2/5P2/1RPk1r2/5p2/1nPPpP2/1P6/r7 w - - 0 1)

Narroway, Edward

Vancouver Province, 1957

1BKNN1Qn/5p2/5P2/1RPk1r2/5p2/1nPPpP2/1P6/r7

#2

12 + 8

6490 yacpdb 2009
5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Re5
      • 2.Sc7#
    • 1...Rg5
      • 2.Qxg5#
    • 1...Rxf6
      • 2.Sxf6#
    • 1...Sc1
      • 2.c6#
    • 1...Sd2
      • 2.c6#
    • 1...Sd4
      • 2.c4#
    • 1...Sa5
      • 2.c6#
    • 1...Sg6
      • 2.Qxf7#
  • Tries
    • 1.Qg4?
      • threat
        • 2.Qxf5#
      • 1...Rxf6
        • 2.Sxf6#
      • 1...Re5
        • 2.Sc7#
        • 2.Qd7#
      • 1...Rg5
        • 2.Qd7#
        • 2.Qxg5#
      • 1...Rh5
        • 2.Qxh5#
        • 2.Qd7#
      • 1...Sd4
        • 2.c4#
      • 1...Sg6!
    • 1.Qf8?
      • threat
        • 2.Qd6#
      • 1...Rxf6
        • 2.Sxf6#
      • 1...Ra6!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Qxf5#
      • 1...Rxf6
        • 2.Sxf6#
        • 2.Qe4#
      • 1...Re5
        • 2.Sc7#
      • 1...Rg5
        • 2.Qe4#
      • 1...Rh5
        • 2.Qe4#
        • 2.Qxh5#
      • 1...Sd4
        • 2.c4#
      • 1...Sg6
        • 2.Qxf7#

This anticipates 96254(1969)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • R(f);SBLOCK::S(K)
    • R(f);OGATEB::QAR(L),XR(f)
    • R(f);XP(G)::S(K),XR(f)
    • S(b);N_GUARD::R(E)+P(F)
    • S(b);SBLOCK::P(B)
    • S(h);N_GUARD::QAB(L),XP(g)
  • Tries
    • Try
      • Q(L);N_PINP(g)
      • Threat
        • QAR2(L),XR(f)
      • Vars
        • R(f);XP(G)::S(K),XR(f)
        • S(b);SBLOCK::P(B)
      • Refutation
        • S(h);
    • Try
      • Q(L);N_PINP(g)
      • Threat
        • QAR1(L)
      • Vars
        • R(f);XP(G)::S(K),XR(f)
      • Refutation
        • R(a);
  • Actual
    • Q(L);N_PINP(g)
    • Threat
      • QAR2(L),XR(f)
    • Vars
      • R(f);SBLOCK::S(K)
      • R(f);OGATE::QAB1(L)
      • S(b);SBLOCK::P(B)
      • S(h);N_GUARD::QAB(L),XP(g)
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