MESON Chess Problem Database

Problem Display
PID: 206596 (8/2NpR3/3p2P1/4nk1K/8/4P2P/5PP1/5Q2 w - - 0 1)

Neunivako, Pavel Efimovich

64 Shakhmatnoe obozrenie, 1925

8/2NpR3/3p2P1/4nk1K/8/4P2P/5PP1/5Q2

#2

9 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Qb1#
  • Tries
    • 1.Sd5?
      • 1...Sxg6
        • 2.Qd3#
        • 2.Qb1#
        • 2.g4#
        • 2.e4#
      • 1...Sd3
        • 2.Qxd3#
        • 2.g4#
        • 2.e4#
      • 1...Sf3
        • 2.Qd3#
        • 2.Qb1#
        • 2.g4#
        • 2.e4#
      • 1...Sc4
        • 2.Qd3#
        • 2.Qb1#
        • 2.g4#
        • 2.e4#
      • 1...Sg4
        • 2.Qd3#
        • 2.Qb1#
        • 2.e4#
        • 2.hxg4#
      • 1...Sc6
        • 2.Qd3#
        • 2.Qb1#
        • 2.g4#
        • 2.e4#
      • 1...Sf7
        • 2.Qd3#
        • 2.Qb1#
        • 2.g4#
        • 2.e4#
      • 1...Ke4!
    • 1.Rf7+?
      • 1...Ke4
        • 2.Rf4#
      • 1...Sxf7!
    • 1.Qd3+?
      • 1...Kf6
        • 2.Sd5#
      • 1...Sxd3!
    • 1.Qb1+?
      • 1...Kf6
        • 2.Sd5#
      • 1...Sd3!
  • Keys
    • 1.Qa1!
      • 1...Ke4
        • 2.Qb1#
      • 1...Kf6
        • 2.Rf7#
      • 1...Sxg6
        • 2.g4#
      • 1...d5
        • 2.Qxe5#
      • 1...Sd3
        • 2.g4#
      • 1...Sf3
        • 2.g4#
      • 1...Sc4
        • 2.g4#
      • 1...Sg4
        • 2.hxg4#
      • 1...Sc6
        • 2.g4#
      • 1...Sf7
        • 2.g4#

This is a version of 206595

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • K(b);P_SPINS(a),S_FLIGHT::QAB(A)
  • Tries
    • Try
      • S(H);
      • Refutation
        • K(b);P_SPINS(a),S_FLIGHT
    • Try
      • R(I);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::R1(I)
      • Refutation
        • S(a);XR(I)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::S(H)
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::S(H)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • Q(A);
    • Vars
      • K(b);P_SPINS(a),S_FLIGHT::QAB(A)
      • K(b);P-FLIGHT,P_SPINS(a)::R1(I)
      • S(a);N_GUARD,XP(G)::P(C)
      • P(c);N_GUARD::QAR1(A),XS(a)
      • S(a);N_GUARD::P(C)
      • S(a);OGATE::P(E),XS(a)
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