MESON Chess Problem Database

Problem Display
PID: 98570 (8/8/3P4/kp6/PN6/p1Q5/P1p5/K1B5 w - - 0 1)

Pypa, Volodimir Iosifovich

Problem Observer, 1973

8/8/3P4/kp6/PN6/p1Q5/P1p5/K1B5

#2

7 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kxa4
      • 2.Qxa3#
    • 1...Kb6
      • 2.Qc7#
    • 1...bxa4
      • 2.Qc5#
  • Tries
    • 1.Qd4?
      • 1...bxa4
        • 2.Qc5#
      • 1...Kxa4!
    • 1.Qe3?
      • 1...Kxa4
        • 2.Qxa3#
      • 1...bxa4
        • 2.Qc5#
      • 1...Kxb4!
    • 1.d7?
      • 1...Kxa4
        • 2.Qxa3#
      • 1...bxa4
        • 2.Qc5#
      • 1...Kb6!
  • Keys
    • 1.Qxc2!
      • 1...Kxb4
        • 2.Bd2#
      • 1...Kb6
        • 2.Qc7#
      • 1...bxa4
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(c);OGATEB,P-FLIGHT,XP(E)::QAR1(D),XP(b)
    • K(c);S_FLIGHT::QAB1(D)
    • P(d);OGATEB,SBLOCK,XP(E)::QAR2(D)
  • Tries
    • Try
      • Q(D);
      • Vars
        • P(d);OGATEB,SBLOCK,XP(E)::QAR2(D)
      • Refutation
        • K(c);P-FLIGHT,XP(E)
    • Try
      • Q(D);
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(E)::QAR1(D),XP(b)
        • P(d);OGATEB,SBLOCK,XP(E)::QAR2(D)
      • Refutation
        • K(c);S_FLIGHT,XS(F)
    • Try
      • P(G);
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(E)::QAR1(D),XP(b)
        • P(d);OGATEB,SBLOCK,XP(E)::QAR2(D)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(D);XP(a)
    • Vars
      • K(c);OGATEB,S_FLIGHT,XS(F)::B(B)
      • K(c);S_FLIGHT::QAB1(D)
      • P(d);OGATEB,SBLOCK,XP(E)::QAR2(D)
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