MESON Chess Problem Database

Problem Display
PID: 89130 (8/Qn6/n2PP2p/1pp4P/1p1kN3/1B1p1P1p/3K1P1B/8 w - - 0 1)

Spodin, Nikolai Ivanovich

1st Prize, Problemista Czestochowa, 1966

8/Qn6/n2PP2p/1pp4P/1p1kN3/1B1p1P1p/3K1P1B/8

#2

10 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sc7
      • 2.Qa1#
    • 1...Sb8
      • 2.Qa1#
    • 1...Sa5
      • 2.Qg7#
    • 1...Sxd6
      • 2.Qg7#
    • 1...Sd8
      • 2.Qg7#
  • Tries
    • 1.Kc1?
      • 1...Sxd6
        • 2.Qg7#
      • 1...Sc7
        • 2.Qa1#
      • 1...Sb8
        • 2.Qa1#
      • 1...Sa5
        • 2.Qg7#
      • 1...Sd8
        • 2.Qg7#
      • 1...d2+!
    • 1.Kd1?
      • 1...Sxd6
        • 2.Qg7#
      • 1...Sc7
        • 2.Qa1#
      • 1...Sb8
        • 2.Qa1#
      • 1...Sa5
        • 2.Qg7#
      • 1...Sd8
        • 2.Qg7#
      • 1...d2!
    • 1.Ke1?
      • 1...Sxd6
        • 2.Qg7#
      • 1...Sc7
        • 2.Qa1#
      • 1...Sb8
        • 2.Qa1#
      • 1...Sa5
        • 2.Qg7#
      • 1...Sd8
        • 2.Qg7#
      • 1...d2+!
    • 1.Sg3?
      • threat
        • 2.Sf5#
      • 1...Sxd6
        • 2.Qg7#
      • 1...Ke5!
    • 1.Sg5?
      • 1...Sxd6
        • 2.Qg7#
      • 1...Sc7
        • 2.Qa1#
      • 1...Sb8
        • 2.Qa1#
      • 1...Sa5
        • 2.Qg7#
      • 1...Sd8
        • 2.Qg7#
      • 1...hxg5!
    • 1.Bg3?
      • 1...Sxd6
        • 2.Qg7#
      • 1...Sc7
        • 2.Qa1#
      • 1...Sb8
        • 2.Qa1#
      • 1...Sa5
        • 2.Qg7#
      • 1...Sd8
        • 2.Qg7#
      • 1...h2!
    • 1.Bf4?
      • 1...Sxd6
        • 2.Qg7#
      • 1...Sc7
        • 2.Qa1#
      • 1...Sb8
        • 2.Qa1#
      • 1...Sa5
        • 2.Qg7#
      • 1...Sd8
        • 2.Qg7#
      • 1...h2!
    • 1.Qa8?
      • threat
        • 2.Qh8#
      • 1...Sb8
        • 2.Qa1#
      • 1...Sd8
        • 2.Qd5#
      • 1...c4!
  • Keys
    • 1.Sxc5!
      • 1...Saxc5
        • 2.Qa1#
      • 1...Sbxc5
        • 2.Qg7#
      • 1...Sxd6
        • 2.Sxa6#
      • 1...Sc7
        • 2.Sxb7#
      • 1...Sb8
        • 2.Sxb7#
      • 1...Sa5
        • 2.Sxa6#
      • 1...Sd8
        • 2.Sxa6#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 5
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(g);OGATE::QAB(J)
    • S(i);OGATE::QAB(J)
    • S(i);OGATE,XP(H)::QAB(J)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Vars
        • S(i);OGATE,XP(H)::QAB(J)
        • S(g);OGATE::QAB(J)
        • S(i);OGATE::QAB(J)
      • Refutation
        • P(a);CHECK
    • Try
      • K(A);P-FLIGHT
      • Vars
        • S(i);OGATE,XP(H)::QAB(J)
        • S(g);OGATE::QAB(J)
        • S(i);OGATE::QAB(J)
      • Refutation
        • P(a);
    • Try
      • K(A);S_FLIGHT
      • Vars
        • S(i);OGATE,XP(H)::QAB(J)
        • S(g);OGATE::QAB(J)
        • S(i);OGATE::QAB(J)
      • Refutation
        • P(a);CHECK
    • Try
      • S(F);
      • Threat
        • S(F)
      • Vars
        • S(i);OGATE,XP(H)::QAB(J)
      • Refutation
        • K(d);N_SPINP(f),S_FLIGHT
    • Try
      • S(F);
      • Vars
        • S(i);OGATE,XP(H)::QAB(J)
        • S(g);OGATE::QAB(J)
        • S(i);OGATE::QAB(J)
      • Refutation
        • P(h);XS(F)
    • Try
      • B(C);
      • Vars
        • S(i);OGATE,XP(H)::QAB(J)
        • S(g);OGATE::QAB(J)
        • S(i);OGATE::QAB(J)
      • Refutation
        • P(b);
    • Try
      • B(C);
      • Vars
        • S(i);OGATE,XP(H)::QAB(J)
        • S(g);OGATE::QAB(J)
        • S(i);OGATE::QAB(J)
      • Refutation
        • P(b);
    • Try
      • Q(J);N_PINP(f)
      • Threat
        • QAB(J)
      • Vars
        • S(g);OGATE::QAB(J)
        • S(i);OGATE::QAR1(J)
      • Refutation
        • P(f);
  • Actual
    • S(F);XP(f)
    • Vars
      • S(g);OGATE,P_SPINS(g),SBLOCK,XS(F)::QAB(J)
      • S(i);OGATE,P_SPINS(i),SBLOCK,XS(F)::QAB(J)
      • S(i);N_GUARD,XP(H)::QAB(J)+S(F),XS(g)
      • S(g);N_GUARD::QAB(J)+S(F),XS(i)
      • S(i);N_GUARD::QAB(J)+S(F),XS(g)
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