MESON Chess Problem Database

Problem Display
PID: 210140 (k4n2/Pr6/2K5/8/8/8/5Q2/7B w - - 0 1)

Hannelius, Jan Ingvar

Land og Folk, 1974

k4n2/Pr6/2K5/8/8/8/5Q2/7B

#2

4 + 3

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rb5
      • 2.Kxb5#
    • 1...Rb6+
      • 2.Kxb6#
    • 1...Rxa7
      • 2.Qxf8#
    • 1...Rc7+
      • 2.Kxc7#
  • Tries
    • 1.Qxf8+?
      • 1...Rb8
        • 2.Qxb8#
        • 2.axb8Q#
      • 1...Kxa7!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Qxb7#
      • 1...Rxb6+
        • 2.Kxb6#
      • 1...Rc7+
        • 2.Kxc7#
      • 1...Rxa7
        • 2.Qd8#
      • 1...Rd7
        • 2.Qb8#
      • 1...Re7
        • 2.Qb8#
      • 1...Rf7
        • 2.Qb8#
      • 1...Rg7
        • 2.Qb8#
      • 1...Rh7
        • 2.Qb8#
      • 1...Rb8
        • 2.Qxb8#
        • 2.axb8Q#
        • 2.axb8R#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • R(a);::B(A)+K(C),XR(a)
    • R(a);CHECK::B(A)+K(C),XR(a)
    • R(a);N_GUARD,SBLOCK,XP(D)::QAR(B),XS(c)
  • Tries
    • Try
      • Q(B);CHECK,XS(c)
      • Refutation
        • K(b);P-FLIGHT,XP(D)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B),XR(a)
    • Vars
      • R(a);CHECK,XQ(B)::B(A)+K(C),XR(a)
      • R(a);CHECK::B(A)+K(C),XR(a)
      • R(a);N_GUARD,SBLOCK,XP(D)::QAR(B)
      • R(a);OGATE::QAR1(B)
      • R(a);OGATE,SBLOCK::QAR1(B)
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