MESON Chess Problem Database

Problem Display
PID: 172122 (4K1R1/1ppRB3/Q3N2p/5k2/4q1NP/1B1Pp2P/b7/8 w - - 0 1)

Apro, Laszlo

Tijdschrift vd KNSB, 1933

4K1R1/1ppRB3/Q3N2p/5k2/4q1NP/1B1Pp2P/b7/8

#2

11 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd3
      • 2.Qxd3#
    • 1...Qd5
      • 2.Rxd5#
    • 1...Qb4
      • 2.Rd5#
    • 1...Qf4
      • 2.Sg7#
    • 1...Qxg4
      • 2.Rd5#
    • 1...Qe5
      • 2.Sxh6#
    • 1...h5
      • 2.Rg5#
  • Tries
    • 1.Rd5+?
      • 1...Qe5
        • 2.Sxe3#
        • 2.Sxh6#
        • 2.Rxe5#
      • 1...Qxd5!
    • 1.Qb5+?
      • 1...Qd5
        • 2.Qxd5#
      • 1...Qe5
        • 2.Sxe3#
        • 2.Sxh6#
        • 2.Qxe5#
      • 1...c5!
  • Keys
    • 1.Bg5!
      • threat
        • 2.Rf7#
      • 1...Qxe6+
        • 2.Qxe6#
      • 1...Qxd3
        • 2.Qxd3#
      • 1...Qxg4
        • 2.Rd5#
      • 1...Qc6
        • 2.Sd4#
      • 1...Qa4
        • 2.Sg7#
      • 1...Qd4
        • 2.Sxd4#
      • 1...Qe5
        • 2.Sxh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • Q(c);OGATE,XP(B)::QAB(F),XQ(c)
    • Q(c);N_GUARD::R(H),XQ(c)
    • Q(c);N_GUARD::R(H)
    • Q(c);SBLOCK::S(G)
    • Q(c);N_GUARD,XS(D)::R(H)
    • Q(c);SBLOCK::S(D),XP(e)
    • P(e);N_GUARD::R1(K)
  • Tries
    • Try
      • R(H);CHECK
      • Refutation
        • Q(c);XR(H)
    • Try
      • Q(F);CHECK
      • Vars
        • Q(c);N_GUARD,P_SPINQ(c)::QAR2(F),XQ(c)
      • Refutation
        • P(g);P_SPINP(g)
  • Actual
    • B(I);P_SPINS(G)
    • Threat
      • R(H)
    • Vars
      • Q(c);CHECK,OGATE,XS(G)::QAB1(F),XQ(c)
      • Q(c);N_PINS(G),OGATE,XP(B)::QAB(F),XQ(c)
      • Q(c);N_GUARD,N_PINS(G),XS(D)::R(H)
      • Q(c);N_PINS(G),P_PINR(H)::S(G)
      • Q(c);N_PINS(G)::S(G),XQ(c)
      • Q(c);SBLOCK::S(D),XP(e)
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