MESON Chess Problem Database

Problem Display
PID: 172068 (6B1/4p3/4pPQ1/1NR2pPp/4k2r/4pRr1/1bP2PP1/B2NKn2 w - - 0 1)

Apro, Laszlo

6th Comm., The Problemist, 1973

6B1/4p3/4pPQ1/1NR2pPp/4k2r/4pRr1/1bP2PP1/B2NKn2

#2

13 + 10

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bc1
      • 2.Sdc3#
      • 2.Re5#
    • 1...Ba3
      • 2.Sdc3#
      • 2.Re5#
    • 1...Bc3+
      • 2.Sdxc3#
    • 1...Be5
      • 2.Rxe5#
    • 1...exf2+
      • 2.Sxf2#
    • 1...e5
      • 2.Bd5#
      • 2.Qxf5#
  • Tries
    • 1.Qe8?
      • threat
        • 2.Qc6#
        • 2.Qa8#
      • 1...Bc3+
        • 2.Sdxc3#
      • 1...exf2+
        • 2.Sxf2#
      • 1...Rxf3!
  • Keys
    • 1.Rfxf5!
      • threat
        • 2.Rf3#
      • 1...Bc3+
        • 2.Sdxc3#
      • 1...exf2+
        • 2.Rxf2#
      • 1...Rxg2
        • 2.f3#
      • 1...Rxg5
        • 2.f3#
      • 1...exf5
        • 2.Qxf5#
      • 1...exf6
        • 2.Rxf6#
      • 1...Rf3
        • 2.Rxf3#
        • 2.gxf3#
      • 1...Rf4
        • 2.Rfe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • B(b);CHECK,N_GUARD::S(B),XB(b)
    • B(b);N_GUARD::R1(I),XB(b)
    • P(c);CHECK,XP(E)::S(B),XP(c)
  • Tries
    • Try
      • Q(L);N_PINP(g)
      • Threat
        • DUALS(2)
      • Vars
        • B(b);CHECK,N_GUARD::S(B),XB(b)
        • P(c);CHECK,XP(E)::S(B),XP(c)
      • Refutation
        • R(d);XR(G)
  • Actual
    • R(G);XP(g)
    • Threat
      • QAB(L)+R(G)
    • Vars
      • B(b);CHECK,N_GUARD::S(B),XB(b)
      • P(c);CHECK,OGATE,XP(E)::QAB(L)+R(G),XP(c)
      • R(d);N_GUARD,XP(F)::P(E)
      • R(d);N_GUARD,XP(J)::P(E)
      • P(i);OGATE,P_SPINP(i),XR(G)::QAB1(L),XP(i)
      • P(j);OGATE,XP(K)::QAB(L)+R(G),XP(j)
      • R(f);SBLOCK::QAB(L)+R(G),DCHECK
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