MESON Chess Problem Database

Problem Display
PID: 272682 (B4q2/4p3/2RN1np1/N2k1p2/3p4/K3Q3/1B6/8 w - - 0 1)

Szwedowski, Leopold Mieczyslaw

The Problemist, 1957

B4q2/4p3/2RN1np1/N2k1p2/3p4/K3Q3/1B6/8

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...d3
      • 2.Qe5#
    • 1...exd6
      • 2.Rc8#
    • 1...e5
      • 2.Qb3#
    • 1...e6
      • 2.Qxd4#
  • Tries
    • 1.Rc5+?
      • 1...Kxc5
        • 2.Qxd4#
      • 1...Kxd6!
    • 1.Ra6+?
      • 1...Kc5
        • 2.Sb3#
        • 2.Bxd4#
        • 2.Qc1#
        • 2.Qxd4#
      • 1...Qxa8!
    • 1.Rb6+?
      • 1...Kc5
        • 2.Bxd4#
        • 2.Qxd4#
      • 1...Qxa8!
  • Keys
    • 1.Se4!
      • threat
        • 2.Qxd4#
      • 1...e5+
        • 2.Rd6#
      • 1...e6+
        • 2.Rc5#
      • 1...Ke5
        • 2.Sxf6#
      • 1...dxe3
        • 2.Rd6#
      • 1...d3
        • 2.Sc3#
        • 2.Rd6#
        • 2.Qd4#
        • 2.Qxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • P(a);::QAR1(C)
    • P(f);SBLOCK,XS(F)::B(G)+R(E)
    • P(f);P_PINS(F),SBLOCK::QAB(C)
    • P(f);P_PINS(F),SBLOCK::QAR1(C),XP(a)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT,P_SPINP(a),XR(E)::QAB1(C),XP(a)
      • Refutation
        • K(b);P-FLIGHT,XS(F)
    • Try
      • R(E);CHECK
      • Refutation
        • Q(g);XB(G)
    • Try
      • R(E);CHECK
      • Refutation
        • Q(g);P_PINS(D),XB(G)
  • Actual
    • S(F);
    • Threat
      • QAR1(C),XP(a)
    • Vars
      • P(f);CHECK,SBLOCK::B(G)+R(E),DCHECK
      • K(b);P-FLIGHT,P_SPINP(a),S_CUTP(f),S_CUTQ(g)::QAR(C)+S(F),XS(d)
      • P(a);XQ(C)::B(G)+R(E),DCHECK
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