MESON Chess Problem Database

Problem Display
PID: 249883 (q1r5/7p/bBN2R1K/rN5p/3p4/3PkP2/3n3Q/bB1n4 w - - 0 1)

Volkmann, Albert

2nd Prize, Deutsche Schachzeitung, 1960

q1r5/7p/bBN2R1K/rN5p/3p4/3PkP2/3n3Q/bB1n4

#2

9 + 11

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sb2
      • 2.Bxd4#
    • 1...Sc3
      • 2.Bxd4#
  • Tries
    • 1.Sbxd4?
      • threat
        • 2.Qe2#
      • 1...Bxd4
        • 2.Bxd4#
      • 1...Bxd3
        • 2.Sc2#
      • 1...Sf2
        • 2.Qf4#
      • 1...Sc3
        • 2.Sb5#
        • 2.Qg1#
      • 1...Rf5!
    • 1.Qg1+?
      • 1...Sf2
        • 2.Qe1#
      • 1...Ke2!
  • Keys
    • 1.Scxd4!
      • threat
        • 2.Qe2#
      • 1...Qxf3
        • 2.Sf5#
      • 1...Bxd4
        • 2.Bxd4#
      • 1...Sf2
        • 2.Qf4#
      • 1...Sc3
        • 2.Sc6#
        • 2.Qg1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(b);S_CUTB(a)::B(F),XP(e)
  • Tries
    • Try
      • S(E);XP(e)
      • Threat
        • QAR1(B)
      • Vars
        • B(a);OGATE,P_SPINB(a),XS(E)::B(F),XB(a)
        • B(h);SBLOCK,XP(C)::B(F)+S(E),DCHECK
        • S(b);SBLOCK::QAB1(B)
      • Refutation
        • R(f);
    • Try
      • Q(B);CHECK
      • Vars
        • S(b);P_SPINS(b)::QAR2(B)
      • Refutation
        • K(d);N_SPINP(e),P-FLIGHT
  • Actual
    • S(G);XP(e)
    • Threat
      • QAR1(B)
    • Vars
      • Q(j);SBLOCK,XP(D)::B(F)+S(G),DCHECK
      • B(a);OGATE,P_SPINB(a),XS(G)::B(F),XB(a)
      • S(b);SBLOCK::QAB1(B)
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