MESON Chess Problem Database

Problem Display
PID: 103607 (8/2Q5/2p1p1B1/3k4/8/2K5/5P2/8 w - - 0 1)

Janocko, Jan

Original, 1990

8/2Q5/2p1p1B1/3k4/8/2K5/5P2/8

#2

4 + 3

6490 yacpdb 2009
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Tries
    • 1.Be4+?
      • 1...Kc5
        • 2.Qxc6#
      • 1...Kxe4!
    • 1.Be8?
      • 1...Kc5
        • 2.Qxc6#
      • 1...e5
        • 2.Qxc6#
      • 1...c5
        • 2.Bc6#
      • 1...Ke4!
    • 1.Qd8+?
      • 1...Ke5
        • 2.Qd4#
      • 1...Kc5!
    • 1.Qd7+?
      • 1...Ke5
        • 2.Qd4#
      • 1...Kc5!
    • 1.f4?
      • threat
        • 2.Qe5#
      • 1...e5
        • 2.Qxe5#
      • 1...c5
        • 2.Qd7#
      • 1...Kc5!
  • Keys
    • 1.Kb4!
      • 1...c5+
        • 2.Qxc5#
      • 1...Kd4
        • 2.Qd6#
      • 1...e5
        • 2.Qd7#

This anticipates 233011(2006)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(C);CHECK
      • Vars
        • K(a);P-FLIGHT,P_SPINP(b)::QAR1(D),XP(b)
      • Refutation
        • K(a);S_FLIGHT,XB(C)
    • Try
      • B(C);
      • Vars
        • K(a);P-FLIGHT,P_SPINP(b)::QAR1(D),XP(b)
        • P(c);SBLOCK::QAB1(D),XP(b)
        • P(b);SBLOCK::B(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAB1(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAB1(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(A);
      • Threat
        • QAR1(D)
      • Vars
        • P(c);::QAR1(D),XP(c)
        • P(b);SBLOCK::QAR2(D)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(b)
  • Actual
    • K(B);S_FLIGHT
    • Vars
      • P(b);CHECK,OGATE::QAR1(D),XP(b)
      • K(a);P-FLIGHT::QAR2(D)
      • P(c);SBLOCK::QAR2(D)
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