MESON Chess Problem Database

Problem Display
PID: 196657 (7Q/4Pp1P/R2n1P1K/2prpkNN/2Rn4/1B3p1P/5P1B/8 w - - 0 1)

Narayanan, Chithathuz Gopatan Sathya

2nd Prize, British Chess Magazine-100 JT, 1978-1980

7Q/4Pp1P/R2n1P1K/2prpkNN/2Rn4/1B3p1P/5P1B/8

#2

13 + 8

133 The Problemist Supplement 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Sg3#
    • 1...Sxb3
      • 2.Sg3#
    • 1...S4b5
      • 2.Sg3#
    • 1...Sc6
      • 2.Sg3#
    • 1...Se6
      • 2.Sg3#
    • 1...Sxc4
      • 2.Sg7#
    • 1...Se4
      • 2.Sg7#
    • 1...S6b5
      • 2.Sg7#
    • 1...Sb7
      • 2.Sg7#
    • 1...Sc8
      • 2.Sg7#
  • Tries
    • 1.Se6?
      • 1...Ke4
        • 2.Bc2#
      • 1...Kxe6
        • 2.Qc8#
      • 1...Sxb3
        • 2.Seg7#
      • 1...Sxe6
        • 2.Sg3#
      • 1...Sxc4
        • 2.Sg3#
      • 1...Sc2
        • 2.Seg7#
      • 1...Se2
        • 2.Seg7#
      • 1...S4b5
        • 2.Seg7#
      • 1...Sc6
        • 2.Seg7#
      • 1...Se4
        • 2.Seg7#
      • 1...S6b5
        • 2.Sg3#
      • 1...Sb7
        • 2.Sg3#
      • 1...Sc8
        • 2.Sg3#
      • 1...Se8
        • 2.Sg3#
      • 1...e4
        • 2.Seg7#
      • 1...fxe6!
    • 1.Bc2+?
      • 1...Sxc2
        • 2.Sg3#
      • 1...Se4
        • 2.Sg7#
        • 2.Bxe4#
      • 1...e4!
    • 1.Rxd6?
      • threat
        • 2.Sg7#
      • 1...Se6
        • 2.Sg3#
      • 1...Rxd6!
    • 1.Qc8+?
      • 1...Sxc8
        • 2.Sg7#
      • 1...Se6!
    • 1.e8S?
      • threat
        • 2.Shg7#
        • 2.Seg7#
      • 1...Se6
        • 2.Sg3#
      • 1...Sxe8!
  • Keys
    • 1.Se4!
      • 1...Kxe4
        • 2.Bc2#
      • 1...Ke6
        • 2.Qc8#
      • 1...Sxb3
        • 2.Sg7#
      • 1...Sxc4
        • 2.Seg3#
      • 1...Sxe4
        • 2.Sg7#
      • 1...Sc2
        • 2.Sg7#
      • 1...Se2
        • 2.Sg7#
      • 1...S4b5
        • 2.Sg7#
      • 1...Sc6
        • 2.Sg7#
      • 1...Se6
        • 2.Seg3#
      • 1...S6b5
        • 2.Seg3#
      • 1...Sb7
        • 2.Seg3#
      • 1...Sc8
        • 2.Seg3#
      • 1...Se8
        • 2.Seg3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 8
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(b);::S(G)
    • S(b);XB(C)::S(G)
    • S(g);XR(E)::S(G)
    • S(g);::S(G)
  • Tries
    • Try
      • S(F);
      • Vars
        • K(f);P_SPINS(b),S_FLIGHT::B(C)
        • K(f);OGATEB,P_SPINS(g),S_FLIGHT,XS(F)::QAB(M)
        • S(b);XB(C)::S(F)
        • S(b);SBLOCK,XS(F)::S(G)
        • S(g);XR(E)::S(G)
        • S(b);::S(F)
        • S(g);SBLOCK::S(F)
        • S(g);::S(G)
        • P(e);SBLOCK::S(F)
      • Refutation
        • P(h);XS(F)
    • Try
      • B(C);CHECK
      • Vars
        • S(b);XB(C)::S(G)
      • Refutation
        • P(e);P_SPINP(e)
    • Try
      • R(H);XS(g)
      • Threat
        • S(G)
      • Vars
        • S(b);::S(G)
      • Refutation
        • R(d);P_PINP(I),XR(H)
    • Try
      • Q(M);CHECK
      • Vars
        • S(g);XQ(M)::S(G)
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • P(K);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);::S(G)
      • Refutation
        • S(g);XS(K)
  • Actual
    • S(F);
    • Vars
      • K(f);OGATEB,P_SPINS(b),S_FLIGHT,XS(F)::B(C)
      • K(f);P_SPINS(g),S_FLIGHT::QAB(M)
      • S(b);XB(C)::S(G)
      • S(g);XR(E)::S(F)
      • S(g);SBLOCK,XS(F)::S(G)
      • S(b);::S(G)
      • S(b);SBLOCK::S(F)
      • S(g);::S(F)
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