MESON Chess Problem Database

Problem Display
PID: 206597 (Q7/2N1Rn2/6P1/4nk1K/8/4P2P/5PP1/8 w - - 0 1)

Neunivako, Pavel Efimovich

64 Shakhmatnoe obozrenie, 1925

Q7/2N1Rn2/6P1/4nk1K/8/4P2P/5PP1/8

#2

9 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sf3
      • 2.Qxf3#
    • 1...Sc4
      • 2.Qf3#
    • 1...Sg4
      • 2.Qf3#
    • 1...Sd7
      • 2.Qf3#
  • Tries
    • 1.Qd5?
      • threat
        • 2.Rxf7#
      • 1...Sg5
        • 2.Qxe5#
      • 1...Sd6
        • 2.Qxe5#
      • 1...Sh6
        • 2.Qxe5#
      • 1...Sd8
        • 2.Qxe5#
      • 1...Sh8
        • 2.Qxe5#
      • 1...Kf6!
    • 1.g4+?
      • 1...Sxg4
        • 2.Qf3#
      • 1...Kf6!
    • 1.e4+?
      • 1...Kf4
        • 2.Se6#
      • 1...Kf6!
  • Keys
    • 1.Qa1!
      • 1...Ke4
        • 2.Qb1#
      • 1...Kf6
        • 2.Rxf7#
      • 1...Sxg6
        • 2.g4#
      • 1...Sg5
        • 2.Qxe5#
      • 1...Sd3
        • 2.g4#
      • 1...Sf3
        • 2.g4#
      • 1...Sc4
        • 2.g4#
      • 1...Sg4
        • 2.hxg4#
      • 1...Sc6
        • 2.g4#
      • 1...Sd7
        • 2.g4#
      • 1...Sd6
        • 2.Qxe5#
      • 1...Sh6
        • 2.Qxe5#
      • 1...Sd8
        • 2.Qxe5#
      • 1...Sh8
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR2(I),XS(a)
    • S(a);N_GUARD::QAR2(I)
  • Tries
    • Try
      • Q(I);P_PINS(a)
      • Threat
        • R(H),XS(c)
      • Vars
        • S(c);N_GUARD::QAR1(I),XS(a)
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT
    • Try
      • P(B);CHECK
      • Vars
        • S(a);XP(B)::QAR2(I)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(C);CHECK
      • Vars
        • K(b);P-FLIGHT::S(G)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(I);
    • Vars
      • K(b);P_SPINS(a),S_FLIGHT::QAB(I)
      • K(b);P-FLIGHT,P_SPINS(a)::R1(H),XS(c)
      • S(a);N_GUARD,XP(F)::P(B)
      • S(c);N_GUARD::QAR1(I),XS(a)
      • S(a);N_GUARD::P(B)
      • S(a);OGATE::P(D),XS(a)
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