MESON Chess Problem Database

Problem Display
PID: 231519 (8/8/8/8/8/pp1p4/kB1Q4/2K5 w - - 0 1)

Ballo, Gyorgy

Magyar Sakkvilag, 1927

8/8/8/8/8/pp1p4/kB1Q4/2K5

#2

3 + 4

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...axb2+
      • 2.Qxb2#
  • Tries
    • 1.Qc3?
      • 1...axb2+
        • 2.Qxb2#
      • 1...d2+!
    • 1.Qf2?
      • 1...axb2+
        • 2.Qxb2#
      • 1...d2+!
    • 1.Qg2?
      • 1...axb2+
        • 2.Qxb2#
      • 1...d2+!
    • 1.Qh2?
      • 1...axb2+
        • 2.Qxb2#
      • 1...d2+!
  • Keys
    • 1.Bxa3+!
      • 1...Ka1
        • 2.Qb2#
      • 1...Kxa3
        • 2.Qa5#
      • 1...b2+
        • 2.Qxb2#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(b);CHECK,OGATE,P_SPINP(b),XB(B)::QAR1(C),XP(b)
  • Tries
    • Try
      • Q(C);
      • Vars
        • P(b);CHECK,OGATE,XB(B)::QAR1(C),XP(b)
      • Refutation
        • P(d);CHECK
    • Try
      • Q(C);
      • Vars
        • P(b);CHECK,OGATE,P_SPINP(b),XB(B)::QAR1(C),XP(b)
      • Refutation
        • P(d);CHECK
    • Try
      • Q(C);
      • Vars
        • P(b);CHECK,OGATE,P_SPINP(b),XB(B)::QAR1(C),XP(b)
      • Refutation
        • P(d);CHECK
    • Try
      • Q(C);
      • Vars
        • P(b);CHECK,OGATE,P_SPINP(b),XB(B)::QAR1(C),XP(b)
      • Refutation
        • P(d);CHECK
  • Actual
    • B(B);CHECK,XP(b)
    • Vars
      • K(a);P-FLIGHT::QAB1(C)
      • K(a);OGATEB,P-FLIGHT,XB(B)::QAR2(C)
      • P(c);CHECK,P_SPINP(c)::QAR1(C),XP(c)
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