MESON Chess Problem Database

Problem Display
PID: 80826 (k1K5/8/8/6p1/8/p2q4/6R1/7Q w - - 0 1)

Hultberg, Gustav Herbert

Springaren, 1961

k1K5/8/8/6p1/8/p2q4/6R1/7Q

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...a2
      • 2.Rxa2#
  • Tries
    • 1.Rg3+?
      • 1...Ka7
        • 2.Qb7#
      • 1...Qe4
        • 2.Rxa3#
      • 1...Qd5
        • 2.Rxa3#
      • 1...Qf3!
    • 1.Rg4+?
      • 1...Ka7
        • 2.Qb7#
      • 1...Qf3
        • 2.Ra4#
      • 1...Qd5
        • 2.Ra4#
      • 1...Qe4!
    • 1.Rxg5+?
      • 1...Ka7
        • 2.Qb7#
      • 1...Qe4
        • 2.Ra5#
      • 1...Qf3
        • 2.Ra5#
      • 1...Qd5!
  • Keys
    • 1.Ra2+!
      • 1...Ka7
        • 2.Qb7#
      • 1...Qe4
        • 2.Rxa3#
      • 1...Qf3
        • 2.Rxa3#
      • 1...Qd5
        • 2.Rxa3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • P(a);::QAB(A)+R(B),DCHECK,XP(a)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(A)
        • Q(b);OGATE,P_SPINQ(b)::R(B),XP(a)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • R(B);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(A)
        • Q(b);P_SPINQ(b)::R(B)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • R(B);CHECK,XP(c)
      • Vars
        • K(d);P-FLIGHT::QAR1(A)
        • Q(b);P_SPINQ(b)::R(B)
      • Refutation
        • Q(b);P_SPINQ(b)
  • Actual
    • R(B);CHECK,P_PINP(a)
    • Vars
      • K(d);P-FLIGHT::QAR1(A)
      • Q(b);P_SPINQ(b)::R(B),XP(a)
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