MESON Chess Problem Database

Problem Display
PID: 245474 (5B2/K4b2/8/pk6/4Q3/3N4/8/8 w - - 0 1)

Shumarin, Vladimir Pavlovich

Kudesnik, 2000

5B2/K4b2/8/pk6/4Q3/3N4/8/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bc4
      • 2.Qe8#
  • Tries
    • 1.Sc5?
      • threat
        • 2.Qa4#
      • 1...Bc4
        • 2.Qb7#
      • 1...a4
        • 2.Qxa4#
      • 1...Bb3!
    • 1.Se5?
      • threat
        • 2.Qc6#
      • 1...a4
        • 2.Qb4#
      • 1...Be8
        • 2.Qc4#
      • 1...Bd5!
    • 1.Qd5+?
      • 1...Ka4
        • 2.Sb2#
      • 1...Bxd5!
    • 1.Qb7+?
      • 1...Ka4
        • 2.Sb2#
      • 1...Kc4!
    • 1.Qb4+?
      • 1...Kc6
        • 2.Qb7#
      • 1...axb4!
  • Keys
    • 1.Sb2!
      • threat
        • 2.Qb7#
        • 2.Qa4#
      • 1...Bd5
        • 2.Qxd5#
        • 2.Qa4#
      • 1...a4
        • 2.Qxa4#
      • 1...Bb3
        • 2.Qb7#
        • 2.Qe8#
      • 1...Bc4
        • 2.Qb7#
        • 2.Qxc4#
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(c);N_GUARD,SBLOCK::QAB(B)
  • Tries
    • Try
      • S(A);
      • Threat
        • QAB1(B)
      • Vars
        • B(c);SBLOCK::QAR2(B)
        • P(a);::QAB1(B),XP(a)
      • Refutation
        • B(c);
    • Try
      • S(A);
      • Threat
        • QAB1(B)
      • Vars
        • P(a);N_GUARD::QAR1(B)
        • B(c);N_GUARD::QAB1(B)
      • Refutation
        • B(c);
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT::S(A)
      • Refutation
        • B(c);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT::S(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAB1(B)
      • Refutation
        • P(a);XQ(B)
  • Actual
    • S(A);
    • Threat
      • DUALS(2)
    • Vars
      • P(a);::QAB1(B),XP(a)
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