MESON Chess Problem Database

Problem Display
PID: 232829 (2n1Q3/q7/8/2BB4/1P2P3/k1pK4/1NR5/8 w - - 0 1)

Koller, Paul

Freie Presse, 1975

2n1Q3/q7/8/2BB4/1P2P3/k1pK4/1NR5/8

#2

8 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc5
      • 2.Qa4#
    • 1...Qb6
      • 2.Qa4#
    • 1...Qb8
      • 2.Qa4#
      • 2.b5#
    • 1...Qa4
      • 2.Qxa4#
    • 1...Qa5
      • 2.bxa5#
    • 1...Qa6+
      • 2.b5#
    • 1...Qb7
      • 2.Qa4#
      • 2.b5#
    • 1...Qc7
      • 2.Qa4#
    • 1...Qd7
      • 2.b5#
    • 1...Qe7
      • 2.Qa4#
    • 1...Qf7
      • 2.Qa4#
      • 2.b5#
    • 1...Qg7
      • 2.Qa4#
      • 2.b5#
    • 1...Qh7
      • 2.Qa4#
      • 2.b5#
    • 1...Qa8
      • 2.b5#
    • 1...Sb6
      • 2.b5#
    • 1...cxb2
      • 2.Rc3#
  • Keys
    • 1.Qd7!
      • 1...Qa6+
        • 2.b5#
      • 1...Qxc5
        • 2.Qa4#
      • 1...Qxd7
        • 2.b5#
      • 1...cxb2
        • 2.Rc3#
      • 1...Sd6
        • 2.Qxa7#
      • 1...Qb6
        • 2.Qa4#
      • 1...Qb8
        • 2.Qa4#
        • 2.b5#
      • 1...Qa4
        • 2.Qxa4#
      • 1...Qa5
        • 2.bxa5#
      • 1...Qb7
        • 2.Qa4#
        • 2.b5#
      • 1...Qc7
        • 2.Qa4#
      • 1...Qa8
        • 2.b5#
      • 1...Sb6
        • 2.b5#
      • 1...Se7
        • 2.Qxa7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(c);N_GUARD,XB(F)::QAR1(H)
    • Q(c);N_GUARD::QAR1(H)
    • Q(c);N_GUARD::QAR1(H),XQ(c)
    • Q(c);OGATE::B(F)+P(D),XQ(c)
    • Q(c);CHECK,N_GUARD::B(F)+P(D)
    • Q(c);N_GUARD,P_PINB(G)::B(F)+P(D)
    • Q(c);N_GUARD::B(F)+P(D)
    • S(d);S_CUTQ(c)::B(F)+P(D)
    • P(b);SBLOCK,XS(A)::R(B)
  • Actual
    • Q(H);
    • Vars
      • Q(c);CHECK,N_GUARD::B(F)+P(D)
      • Q(c);N_GUARD,XB(F)::QAR1(H)
      • Q(c);N_GUARD,P_PINB(G),XQ(H)::B(F)+P(D)
      • P(b);SBLOCK,XS(A)::R(B)
      • S(d);N_GUARD::QAR(H),XQ(c)
      • Q(c);N_GUARD::QAR1(H)
      • Q(c);N_GUARD::QAR1(H),XQ(c)
      • Q(c);OGATE::B(F)+P(D),XQ(c)
      • Q(c);N_GUARD::B(F)+P(D)
      • S(d);S_CUTQ(c)::B(F)+P(D)
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