MESON Chess Problem Database

Problem Display
PID: 137903 (4b3/8/p3Q3/6p1/4Nk2/1P2n3/K4Pq1/4NR2 w - - 0 1)

Ellerman, Arnoldo

2nd Prize, L'Italia Scacchistica, 1926

4b3/8/p3Q3/6p1/4Nk2/1P2n3/K4Pq1/4NR2

#2

7 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qf3
      • 2.Sd3#
    • 1...Qxf2+
      • 2.Rxf2#
    • 1...Qg3
      • 2.fxg3#
  • Keys
    • 1.Sg3!
      • threat
        • 2.Se2#
      • 1...Qxf1
        • 2.Qe4#
      • 1...Qxg3
        • 2.fxe3#
      • 1...Sf5
        • 2.Qxf5#
      • 1...g4
        • 2.Qxe3#
      • 1...Qf3
        • 2.Sd3#
      • 1...Bb5
        • 2.Sh5#
      • 1...Bh5
        • 2.Sxh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • Q(a);N_PINP(D),SBLOCK::S(A)
    • Q(a);CHECK,OGATE,P_SPINQ(a),XP(D)::R(B),XQ(a)
    • Q(a);N_PINP(D)::R(B)+P(D)DCHECK,XQ(a)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • Q(a);N_GUARD,N_PINP(D),XR(B)::QAR1(G)
      • Q(a);N_PINP(D),SBLOCK,XS(F)::R(B)+P(D)DCHECK,XS(b)
      • S(b);N_GUARD::QAR1(G),XS(b)
      • P(d);SBLOCK::QAB1(G),XS(b)
      • Q(a);N_PINP(D),SBLOCK::S(A)
      • B(f);N_GUARD::S(F)
      • B(f);N_GUARD::S(F),XB(f)
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