MESON Chess Problem Database

Problem Display
PID: 156937 (n4R2/4N2b/2Qp1qp1/KR6/4Nkrn/4p1p1/1B4P1/8 w - - 0 1)

Akerblom, Johan Axel

L'Alfiere di Re, 1925

n4R2/4N2b/2Qp1qp1/KR6/4Nkrn/4p1p1/1B4P1/8

#2

8 + 10

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Sxg2
      • 2.Rxf6#
    • 1...Sf3
      • 2.Rxf6#
    • 1...e2
      • 2.Bc1#
  • Tries
    • 1.Sg5?
      • threat
        • 2.Sh3#
        • 2.Se6#
        • 2.Qe4#
        • 2.Qc4#
        • 2.Qxd6#
      • 1...Rxg5
        • 2.Qc4#
      • 1...Qf5
        • 2.Sh3#
        • 2.Se6#
      • 1...Sf5
        • 2.Sh3#
      • 1...e2
        • 2.Bc1#
        • 2.Qe4#
        • 2.Qc1#
      • 1...Bg8
        • 2.Sh3#
        • 2.Qe4#
        • 2.Qxd6#
      • 1...Sf3
        • 2.Sh3#
        • 2.Se6#
        • 2.Rxf6#
        • 2.Qxf3#
        • 2.Qe4#
      • 1...Sb6
        • 2.Sh3#
        • 2.Se6#
        • 2.Qe4#
        • 2.Qxd6#
      • 1...Sc7
        • 2.Sh3#
        • 2.Qe4#
        • 2.Qc4#
        • 2.Qxd6#
      • 1...d5!
    • 1.Sd5+?
      • 1...Kxe4
        • 2.Qc2#
      • 1...Kf5!
  • Keys
    • 1.Rb4!
      • threat
        • 2.Qxd6#
      • 1...Qf5+
        • 2.Sd5#
      • 1...Rg5+
        • 2.Sc5#
      • 1...Sxg2
        • 2.Rxf6#
      • 1...e2
        • 2.Qc1#
      • 1...Sf3
        • 2.Rxf6#
      • 1...Sf5
        • 2.Sd5#
      • 1...d5
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(e);N_GUARD,XP(B)::R(H),XQ(g)
    • S(e);N_GUARD::R(H),XQ(g)
    • P(a);OGATEB::B(A)
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(5)
      • Vars
        • R(d);P_PINR(E),XS(C)::QAR(F)
        • S(e);N_SPINQ(g)::S(C)
      • Refutation
        • P(f);
    • Try
      • S(G);CHECK
      • Vars
        • K(c);N_SPINQ(g),P-FLIGHT,XS(C)::QAB(F)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • R(E);
    • Threat
      • QAB(F),XP(f)
    • Vars
      • Q(g);CHECK::S(G)
      • R(d);CHECK,SBLOCK::R(E)+S(C)
      • S(e);N_GUARD,XP(B)::R(H),XQ(g)
      • P(a);OGATEB::QAB(F)
      • S(e);N_GUARD::R(H),XQ(g)
      • S(e);N_SPINQ(g),SBLOCK::S(G)
      • P(f);::QAB(F)
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