MESON Chess Problem Database

Problem Display
PID: 68200 (b5n1/5p1K/7p/5R1p/3Qq2k/6pP/4N3/2B4R w - - 0 1)

di Scala, Pascal

Phenix, 1997

b5n1/5p1K/7p/5R1p/3Qq2k/6pP/4N3/2B4R

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Qxf4#
    • 1...Sf6+
      • 2.Qxf6#
    • 1...Se7
      • 2.Qf6#
    • 1...g2
      • 2.Qf2#
  • Tries
    • 1.Bxh6?
      • threat
        • 2.Bg5#
      • 1...Sf6+
        • 2.Qxf6#
      • 1...Sxh6
        • 2.Qf6#
      • 1...f6!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Sg2#
      • 1...Qxf5+
        • 2.Sg6#
      • 1...Sf6+
        • 2.Qxf6#
      • 1...Qxh1
        • 2.Rxh5#
      • 1...Qxd4
        • 2.Rxh5#
      • 1...Qxf4
        • 2.Qxf4#
      • 1...g2
        • 2.Qf2#
      • 1...Qg2
        • 2.Sxg2#
        • 2.Sg6#
        • 2.Rxh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(b);N_PINR(F),OGATE::QAR2(E),XQ(b)
    • S(h);CHECK,N_GUARD::QAB(E),XS(h)
    • S(h);N_GUARD::QAB(E)
    • P(a);OGATEB::QAB(E)
  • Tries
    • Try
      • B(A);XP(e)
      • Threat
        • B(A)
      • Vars
        • S(h);CHECK,N_GUARD::QAB(E),XS(h)
        • S(h);N_GUARD,XB(A)::QAB(E)
      • Refutation
        • P(f);
  • Actual
    • S(C);N_PINQ(b)
    • Threat
      • S(C)
    • Vars
      • Q(b);CHECK,XR(F)::QAR(E)+S(C),DCHECK
      • S(h);CHECK,N_GUARD::QAB(E),XS(h)
      • Q(b);N_PINR(F),XR(B)::R1(F),XP(d)
      • Q(b);N_PINR(F),XQ(E)::R1(F),XP(d)
      • Q(b);N_PINR(F),OGATE,P_SPINQ(b),XS(C)::QAR2(E),XQ(b)
      • P(a);OGATEB::QAB(E)
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