MESON Chess Problem Database

Problem Display
PID: 223596 (b2b4/1q2p3/P5BK/pk1PR3/1NNP4/1Q6/8/R7 w - - 0 1)

Makaronets, Leonid

Best Problems, 2020

b2b4/1q2p3/P5BK/pk1PR3/1NNP4/1Q6/8/R7

#2

10 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa6
      • 2.Sa2#
      • 2.Sc2#
      • 2.Sd3#
      • 2.Sc6#
    • 1...Qc6
      • 2.dxc6#
    • 1...Qb6
      • 2.Sa3#
    • 1...Bb6
      • 2.Sa3#
  • Tries
    • 1.Be8+?
      • 1...Qc6+
        • 2.dxc6#
        • 2.d6#
      • 1...Qd7!
    • 1.axb7?
      • threat
        • 2.Be8#
        • 2.d6#
      • 1...axb4
        • 2.Be8#
      • 1...Bb6
        • 2.Sa3#
        • 2.Be8#
      • 1...Bxb7!
  • Keys
    • 1.Bd3!
      • threat
        • 2.Qa4#
      • 1...Qxa6+
        • 2.Sc6#
      • 1...Qc6+
        • 2.dxc6#
      • 1...Qb6+
        • 2.Sd6#
      • 1...a4
        • 2.Qxa4#

This is after 214816

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(c);OGATE,P_PINB(I)::R(G)+P(F),XQ(c)
    • Q(c);P_PINB(I),SBLOCK::S(D)
    • B(f);SBLOCK::S(D)
  • Tries
    • Try
      • B(I);CHECK
      • Refutation
        • Q(c);P_SPINQ(c)
    • Try
      • P(H);XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • P(a);P_SPINP(a),XS(C)::B(I)
      • Refutation
        • B(e);XP(H)
  • Actual
    • B(I);
    • Threat
      • QAB1(B)
    • Vars
      • Q(c);CHECK,SBLOCK,XP(H)::QAR(B)+S(C)
      • Q(c);CHECK,OGATE::R(G)+P(F),XQ(c)
      • Q(c);CHECK,SBLOCK::B(I)+S(D),DCHECK
      • P(a);::QAB1(B),XP(a)
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