MESON Chess Problem Database

Problem Display
PID: 205336 (4r3/4Q3/2p4q/3pN1R1/1P1knbp1/3P3P/2K1PP2/8 w - - 0 1)

Groeneveld, Cornelis

American Chess Bulletin, 1961

4r3/4Q3/2p4q/3pN1R1/1P1knbp1/3P3P/2K1PP2/8

#2

9 + 8

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg5
      • 2.Sxc6#
    • 1...Qg7
      • 2.Sxc6#
    • 1...Qf8
      • 2.Sxc6#
    • 1...Qxh3
      • 2.Sxc6#
    • 1...Qh4
      • 2.Sxc6#
    • 1...Qh5
      • 2.Sxc6#
    • 1...Qh7
      • 2.Sxc6#
    • 1...Qh8
      • 2.Sxc6#
    • 1...Bh2
      • 2.e3#
    • 1...Bg3
      • 2.e3#
    • 1...Bxe5
      • 2.e3#
    • 1...Sd2
      • 2.Qc5#
    • 1...Sxf2
      • 2.Qc5#
    • 1...Sc3
      • 2.Qc5#
    • 1...Sg3
      • 2.Qc5#
    • 1...Sc5
      • 2.Qxc5#
    • 1...Sd6
      • 2.Sxc6#
    • 1...Sf6
      • 2.Sxc6#
      • 2.Qc5#
    • 1...gxh3
      • 2.Sf3#
    • 1...g3
      • 2.Sf3#
  • Tries
    • 1.Qa7+?
      • 1...Sc5
        • 2.Qxc5#
        • 2.Qa1#
      • 1...c5!
    • 1.hxg4?
      • threat
        • 2.Sf3#
      • 1...Bxe5
        • 2.e3#
      • 1...Qh1
        • 2.Sxc6#
      • 1...Qh3
        • 2.Sxc6#
      • 1...Sd2
        • 2.Qc5#
      • 1...Sxg5!
  • Keys
    • 1.Rxg4!
      • threat
        • 2.Sf3#
      • 1...Qxh3
        • 2.Sxc6#
      • 1...Bxe5
        • 2.Qc5#
      • 1...Sd2
        • 2.e3#
      • 1...Sg5
        • 2.e3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 16
  • Sets
    • Q(g);N_GUARD,XR(H)::S(G),XP(f)
    • Q(g);N_GUARD::S(G),XP(f)
    • Q(g);N_GUARD,XP(E)::S(G),XP(f)
    • B(c);N_GUARD::P(B)
    • B(c);N_GUARD,XS(G)::P(B)
    • S(b);N_GUARD::QAB1(I)
    • S(b);N_GUARD,XP(C)::QAB1(I)
    • S(b);N_GUARD::QAB1(I),XS(b)
    • S(b);S_CUTQ(g)::S(G),XP(f)
    • P(d);N_GUARD,XP(E)::S(G)
    • P(d);N_GUARD::S(G)
  • Tries
    • Try
      • Q(I);CHECK
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • P(E);XP(d)
      • Threat
        • S(G)
      • Vars
        • B(c);N_GUARD,XS(G)::P(B)
        • Q(g);N_GUARD::S(G),XP(f)
        • S(b);N_GUARD::QAB1(I)
      • Refutation
        • S(b);XR(H)
  • Actual
    • R(H);XP(d)
    • Threat
      • S(G)
    • Vars
      • Q(g);N_GUARD,XP(E)::S(G),XP(f)
      • B(c);P_SPINS(b),SBLOCK,XS(G)::QAB1(I)
      • S(b);P_SPINB(c)::P(B)
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