MESON Chess Problem Database

Problem Display
PID: 11914 (4NQB1/2r5/2R3rn/1P2k1p1/4n1P1/1p1P2P1/1qp2BK1/6b1 w - - 0 1)

Narayanan, Chithathuz Gopatan Sathya

3rd Prize, Northwest Chess, 1973-1975

4NQB1/2r5/2R3rn/1P2k1p1/4n1P1/1p1P2P1/1qp2BK1/6b1

#2

10 + 10

102 Probleemblad 1977
273 Mat Plus 1994

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.d4#
    • 1...Qa3
      • 2.d4#
    • 1...Qb1
      • 2.d4#
    • 1...Qa2
      • 2.d4#
    • 1...Sd2
      • 2.Qc5#
    • 1...Sxf2
      • 2.Qc5#
    • 1...Sc5
      • 2.Qxc5#
    • 1...Sf6
      • 2.Qd6#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sxg8
      • 2.Qf5#
  • Tries
    • 1.Re6+?
      • 1...Kd5
        • 2.Sxc7#
      • 1...Rxe6!
    • 1.Qe7+?
      • 1...Re6
        • 2.Qxe6#
      • 1...Rxe7!
    • 1.Qf3?
      • threat
        • 2.Qxe4#
      • 1...Sxf2
        • 2.Qd5#
      • 1...Sxg3
        • 2.Qxg3#
      • 1...Sd2
        • 2.Qd5#
      • 1...Sc3
        • 2.d4#
      • 1...Sc5
        • 2.Qd5#
      • 1...Sd6
        • 2.Qd5#
      • 1...Sf6
        • 2.Re6#
      • 1...Qd4!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qxe4#
      • 1...Sxf2
        • 2.Qc5#
      • 1...Sxg3
        • 2.Bxg3#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Sd2
        • 2.Qc5#
      • 1...Sc3
        • 2.Qd4#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sd6
        • 2.Qc5#
      • 1...Sf6
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • Q(b);N_GUARD::P(C)
    • S(e);N_GUARD::QAR2(I)
    • S(e);N_GUARD,XB(A)::QAR2(I)
    • S(e);N_GUARD::QAR2(I),XS(e)
    • S(e);N_GUARD,S_CUTR(h)::QAB1(I)
    • S(i);N_GUARD::QAR1(I),XS(i)
    • S(i);N_GUARD,XB(J)::QAR1(I)
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • K(f);P-FLIGHT::S(H),XR(j)
      • Refutation
        • R(h);XR(G)
    • Try
      • Q(I);CHECK
      • Vars
        • R(h);N_GUARD,P_SPINR(h)::QAR1(I),XR(h)
      • Refutation
        • R(j);XQ(I)
    • Try
      • Q(I);
      • Threat
        • QAR1(I),XS(e)
      • Vars
        • S(e);OGATE,XB(A)::QAR1(I)
        • S(e);OGATE,XP(D)::QAB(I),XS(e)
        • S(e);OGATE::QAR1(I)
        • S(e);S_CUTQ(b)::P(C)
        • S(e);S_CUTR(h)::R1(G)
      • Refutation
        • Q(b);
  • Actual
    • Q(I);
    • Threat
      • QAR1(I),XS(e)
    • Vars
      • S(e);N_GUARD,XB(A)::QAR2(I)
      • S(e);OGATE,XP(D)::B(A),XS(e)
      • Q(b);N_GUARD::QAB1(I),XQ(b)
      • S(e);N_GUARD::QAR2(I)
      • S(e);S_CUTQ(b)::QAB1(I)
      • S(e);N_GUARD::QAR2(I),XS(e)
      • S(e);N_GUARD,S_CUTR(h)::QAB1(I)
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