MESON Chess Problem Database

Problem Display
PID: 225980 (8/4pP1B/2Pr3P/K1N1k1N1/2P3pP/B1p1Pq1b/3R1R2/1Q3r2 w - - 0 1)

Neptaev, Nikolai I

Zadachi i Etyudi, 1999

8/4pP1B/2Pr3P/K1N1k1N1/2P3pP/B1p1Pq1b/3R1R2/1Q3r2

#2

14 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Qe4#
      • 2.Qf5#
    • 1...Qh1
      • 2.Qf5#
    • 1...Qe2
      • 2.Qe4#
      • 2.Qf5#
    • 1...Qg2
      • 2.Qf5#
    • 1...Qe4
      • 2.Qxe4#
    • 1...Qd5
      • 2.Qf5#
    • 1...Qxc6
      • 2.Qf5#
    • 1...Qxe3
      • 2.Qf5#
    • 1...Qg3
      • 2.Qe4#
      • 2.Qf5#
    • 1...Qf5
      • 2.Qxf5#
    • 1...Qf6
      • 2.Qe4#
    • 1...Qxf7
      • 2.Sxf7#
      • 2.Qe4#
    • 1...Rxc6
      • 2.Sd7#
    • 1...Re6
      • 2.Sd7#
    • 1...Rf6
      • 2.Sd3#
      • 2.Sd7#
    • 1...Rg6
      • 2.Sd7#
    • 1...Rxh6
      • 2.Sd7#
    • 1...Rd7
      • 2.Sxd7#
  • Tries
    • 1.Sd3+?
      • 1...Kf6
        • 2.f8Q#
        • 2.f8R#
      • 1...Rxd3!
    • 1.Sxf3+?
      • 1...Kf6
        • 2.Qf5#
        • 2.Qg6#
        • 2.f8Q#
        • 2.f8R#
      • 1...gxf3!
    • 1.Rd5+?
      • 1...Kf6
        • 2.Sce4#
        • 2.Qg6#
        • 2.f8Q#
        • 2.f8R#
      • 1...Qxd5
        • 2.Qf5#
      • 1...Rxd5!
    • 1.Qe4+?
      • 1...Kf6
        • 2.f8Q#
        • 2.f8R#
      • 1...Qxe4!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Sd7#
      • 1...Kf6
        • 2.Sce4#
      • 1...Qd5
        • 2.Sd3#
      • 1...Rd7
        • 2.Sxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 11
  • Sets
    • Q(c);N_GUARD::QAR1(A)
    • Q(c);N_GUARD::QAR1(A),XQ(c)
    • Q(c);N_GUARD,P_PINS(I)::QAR1(A)
    • Q(c);N_GUARD,XP(K)::QAR1(A)
    • Q(c);N_GUARD,XP(E)::QAR1(A)
    • R(g);N_GUARD,XP(K)::S(I)
    • R(g);N_GUARD::S(I)
    • R(g);N_GUARD,XP(L)::S(I)
    • R(g);N_GUARD::S(I),XR(g)
  • Tries
    • Try
      • S(I);CHECK
      • Vars
        • K(f);P_SPINQ(c),S_FLIGHT::P=Q
      • Refutation
        • R(g);XS(I)
    • Try
      • S(J);CHECK,XQ(c)
      • Refutation
        • P(e);XS(J)
    • Try
      • R(B);CHECK
      • Vars
        • Q(c);P_PINS(I),XR(B)::QAR1(A)
      • Refutation
        • R(g);P_PINS(I),XR(B)
    • Try
      • Q(A);CHECK
      • Vars
        • K(f);P_SPINQ(c),S_FLIGHT::P=Q
      • Refutation
        • Q(c);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR(A)+S(I),DCHECK
    • Vars
      • K(f);P_SPINQ(c),S_FLIGHT::S(I)
      • Q(c);::S(I)
      • R(g);::QAR(A)+S(I),DCHECK,XR(g)
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