MESON Chess Problem Database

Problem Display
PID: 138924 (1K6/5pN1/4p2n/4p3/2P1kr1P/4P3/3PP1R1/5r1Q w - - 0 1)

Vlaar, J

Probleemblad, 1974

1K6/5pN1/4p2n/4p3/2P1kr1P/4P3/3PP1R1/5r1Q

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1+
      • 2.Qxb1#
    • 1...R1f2
      • 2.Qb1#
    • 1...R1f3
      • 2.Qb1#
    • 1...R4f2
      • 2.Rg4#
    • 1...Rg4
      • 2.Rxg4#
    • 1...Rxh4
      • 2.Rg4#
    • 1...Rf5
      • 2.Rg4#
    • 1...Rf6
      • 2.Rg4#
  • Tries
    • 1.Rf2+?
      • 1...Rf3
        • 2.Qxf3#
      • 1...Rxh1!
    • 1.Rg3+?
      • 1...Rxh1
        • 2.d3#
      • 1...R1f3
        • 2.Qb1#
      • 1...R4f3!
    • 1.Rg4+?
      • 1...Rf3
        • 2.Qxf3#
        • 2.Qb1#
      • 1...Rxh1!
  • Keys
    • 1.Se8!
      • threat
        • 2.Sd6#
      • 1...Rb1+
        • 2.Qxb1#
      • 1...Kf5
        • 2.Rg5#
      • 1...Sf5
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • R(a);CHECK,OGATE::QAB(A),XR(a)
    • R(a);OGATE::QAB(A)
    • R(c);::QAB(A)+R(D),DCHECK
    • R(c);::QAB(A)+R(D),DCHECK,XR(c)
    • R(c);XP(G)::QAB(A)+R(D),DCHECK
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAB1(A),XR(c)
      • Refutation
        • R(a);XQ(A)
    • Try
      • R(D);CHECK
      • Vars
        • R(a);XQ(A)::P(B)
        • R(a);OGATE,P_SPINR(a)::QAB(A)
      • Refutation
        • R(c);P_SPINR(c)
    • Try
      • R(D);CHECK,P_PINR(c)
      • Refutation
        • R(a);XQ(A)
  • Actual
    • S(H);
    • Threat
      • S(H)
    • Vars
      • R(a);CHECK,OGATE::QAB(A),XR(a)
      • K(b);S_FLIGHT::R1(D)
      • S(f);SBLOCK,S_CUTR(c)::S(H)
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