MESON Chess Problem Database

Problem Display
PID: 51546 (nN1Q1n2/3q4/p1R1p3/1P2R2p/p1Nk1P2/P4p2/2K5/7b w - - 0 1)

Subrahmanyam, Swaminatha

The Guardian, 1964

nN1Q1n2/3q4/p1R1p3/1P2R2p/p1Nk1P2/P4p2/2K5/7b

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qd6
      • 2.Qxd6#
    • 1...Sb6
      • 2.Qxb6#
    • 1...Sg6
      • 2.Qxd7#
    • 1...Sh7
      • 2.Qxd7#
  • Tries
    • 1.Sb2?
      • threat
        • 2.Rc4#
      • 1...Sb6
        • 2.Qxb6#
      • 1...axb5!
    • 1.Sd2?
      • threat
        • 2.Rc4#
      • 1...Sb6
        • 2.Qxb6#
      • 1...axb5!
    • 1.Se3?
      • threat
        • 2.Rc4#
      • 1...Sb6
        • 2.Qxb6#
      • 1...axb5!
    • 1.Sa5?
      • threat
        • 2.Rc4#
      • 1...Sb6
        • 2.Qxb6#
      • 1...axb5!
    • 1.Sb6?
      • threat
        • 2.Rc4#
      • 1...Sxb6
        • 2.Qxb6#
      • 1...axb5!
    • 1.Qh4?
      • threat
        • 2.Qf2#
        • 2.f5#
      • 1...Qh7+
        • 2.f5#
      • 1...f2
        • 2.Qxf2#
      • 1...Qd5
        • 2.Qf2#
      • 1...Qe7
        • 2.Qf2#
      • 1...Qg7
        • 2.Qf2#
      • 1...Qd8
        • 2.Qf2#
      • 1...Sg6
        • 2.Qf2#
      • 1...Qxc6!
    • 1.Qa5?
      • threat
        • 2.Qd2#
        • 2.Qc3#
      • 1...Qxc6
        • 2.Qc3#
      • 1...Qh7+!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Rc4#
      • 1...Qxc6+
        • 2.Sxc6#
      • 1...Qh7+
        • 2.Sf5#
      • 1...Qxd6
        • 2.Qxd6#
      • 1...axb5
        • 2.Sxb5#
      • 1...Qc8
        • 2.Sf5#
      • 1...Qc7
        • 2.Sf5#
      • 1...Sb6
        • 2.Qxb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • Q(h);OGATE::QAR2(I),XQ(h)
    • S(i);N_GUARD::QAB(I),XS(i)
    • S(j);N_GUARD::QAR(I),XQ(h)
  • Tries
    • Try
      • S(C);
      • Threat
        • R1(G)
      • Vars
        • S(i);N_GUARD::QAB(I),XS(i)
      • Refutation
        • P(f);XP(E)
    • Try
      • S(C);
      • Threat
        • R1(G)
      • Vars
        • S(i);N_GUARD::QAB(I),XS(i)
      • Refutation
        • P(f);XP(E)
    • Try
      • S(C);
      • Threat
        • R1(G)
      • Vars
        • S(i);N_GUARD::QAB(I),XS(i)
      • Refutation
        • P(f);XP(E)
    • Try
      • S(C);
      • Threat
        • R1(G)
      • Vars
        • S(i);N_GUARD::QAB(I),XS(i)
      • Refutation
        • P(f);XP(E)
    • Try
      • S(C);
      • Threat
        • R1(G)
      • Vars
        • S(i);OGATE,XS(C)::QAB(I),XS(i)
      • Refutation
        • P(f);XP(E)
    • Try
      • Q(I);N_PINQ(h)
      • Threat
        • DUALS(2)
      • Vars
        • Q(h);CHECK::QAR(I)+P(D)
        • P(b);::QAB(I),XP(b)
        • Q(h);::QAB(I)
        • S(j);::QAB(I)
      • Refutation
        • Q(h);P_PINS(C),XR(G)
    • Try
      • Q(I);N_PINQ(h)
      • Threat
        • DUALS(2)
      • Vars
        • Q(h);P_PINS(C),XR(G)::QAB1(I)
      • Refutation
        • Q(h);CHECK
  • Actual
    • S(C);N_PINQ(h)
    • Threat
      • R1(G)
    • Vars
      • Q(h);CHECK,XR(G)::S(H),XQ(h)
      • Q(h);CHECK::QAR(I)+S(C),DCHECK
      • Q(h);OGATE,P_SPINQ(h),XS(C)::QAR2(I),XQ(h)
      • P(f);XP(E)::S(C),XP(f)
      • Q(h);P_PINR(G)::QAR(I)+S(C),DCHECK
      • S(i);N_GUARD::QAB(I),XS(i)
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