MESON Chess Problem Database

Problem Display
PID: 103201 (8/3N4/8/4B3/4k1P1/n3p3/Q1P3K1/8 w - - 0 1)

Maximov, Nikolai J

La Presse, 1895

8/3N4/8/4B3/4k1P1/n3p3/Q1P3K1/8

#2

6 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Qc4#
      • 2.Qa8#
    • 1...Sc4
      • 2.Qxc4#
      • 2.Qa8#
    • 1...Sb5
      • 2.Qa8#
  • Tries
    • 1.Qb3?
      • threat
        • 2.Qd3#
        • 2.Qb7#
      • 1...Sb5
        • 2.Qd3#
      • 1...e2
        • 2.Qd3#
        • 2.Qf3#
      • 1...Sxc2!
    • 1.Qe6?
      • threat
        • 2.Sc5#
        • 2.Sf6#
        • 2.Qc6#
      • 1...Sxc2
        • 2.Sc5#
      • 1...e2!
    • 1.Qxa3?
      • threat
        • 2.Qd3#
        • 2.Qa8#
      • 1...e2
        • 2.Qd3#
        • 2.Qf3#
      • 1...Kd5!
  • Keys
    • 1.c4!
      • 1...Kd3
        • 2.Sc5#
      • 1...Sxc4
        • 2.Qxc4#
      • 1...e2
        • 2.Qxe2#
      • 1...Sb1
        • 2.Qxb1#
        • 2.Qc2#
      • 1...Sc2
        • 2.Qxc2#
      • 1...Sb5
        • 2.Qb1#
        • 2.Qc2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • S(a);OGATE::QAB(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::QAB1(A)
      • Refutation
        • S(a);XP(B)
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • S(a);XP(B)::S(F)
      • Refutation
        • P(b);
    • Try
      • Q(A);XS(a)
      • Threat
        • DUALS(2)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • P(B);
    • Vars
      • K(c);S_FLIGHT::S(F)
      • S(a);OGATE,XP(B)::QAR2(A),XS(a)
      • P(b);OGATEB::QAR2(A),XP(b)
      • S(a);N_GUARD::QAB(A),XS(a)
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