MESON Chess Problem Database

Problem Display
PID: 151410 (1N1n2nK/2bB2B1/3P3p/1RPk2qQ/4pP2/1Pp3p1/r7/8 w - - 0 1)

Akerblom, Johan Axel

L'Alfiere di Re, 1925

1N1n2nK/2bB2B1/3P3p/1RPk2qQ/4pP2/1Pp3p1/r7/8

#2

10 + 10

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Qxe5#
    • 1...Qf5
      • 2.Qxf5#
    • 1...Ra3
      • 2.Qd1#
    • 1...Ra5
      • 2.Qd1#
    • 1...Ra6
      • 2.Qd1#
    • 1...Ra7
      • 2.Qd1#
    • 1...Ra8
      • 2.Qd1#
    • 1...Sc6
      • 2.Qf7#
    • 1...Se6
      • 2.Bc6#
    • 1...Sb7
      • 2.Qf7#
    • 1...Sf7+
      • 2.Qxf7#
    • 1...e3
      • 2.Qf3#
  • Tries
    • 1.Bc6+?
      • 1...Sxc6
        • 2.Qf7#
      • 1...Ke6!
    • 1.Qf7+?
      • 1...Se6
        • 2.Bc6#
        • 2.Bxe6#
        • 2.Qxe6#
      • 1...Sxf7+!
  • Keys
    • 1.Be5!
      • threat
        • 2.c6#
      • 1...Qf6+
        • 2.Bxf6#
      • 1...Qxe5+
        • 2.Qxe5#
      • 1...Qg7+
        • 2.Bxg7#
      • 1...Sf7+
        • 2.Qxf7#
      • 1...Bxd6
        • 2.cxd6#
      • 1...e3
        • 2.Qf3#
      • 1...Ra5
        • 2.Qd1#
      • 1...Bb6
        • 2.cxb6#
      • 1...Sc6
        • 2.Qf7#
      • 1...Se6
        • 2.Bc6#
      • 1...Sb7
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • Q(f);OGATE,P_PINB(H)::QAR1(E),XQ(f)
    • Q(f);OGATE::QAR2(E),XQ(f)
    • R(a);N_GUARD::QAR(E)
    • S(i);N_GUARD::QAB(E)
    • S(i);N_GUARD,SBLOCK::B(G)
    • S(i);CHECK,N_GUARD::QAB(E),XS(i)
    • P(d);OGATEB::QAB(E)
  • Tries
    • Try
      • B(G);CHECK
      • Vars
        • S(i);XB(G)::QAB(E)
      • Refutation
        • K(e);N_SPINQ(f),S_FLIGHT
    • Try
      • Q(E);CHECK,N_PINQ(f)
      • Refutation
        • S(i);CHECK,XQ(E)
  • Actual
    • B(H);N_PINQ(f)
    • Threat
      • R(C)+P(D)
    • Vars
      • Q(f);CHECK,OGATEB::QAR(E)+B(H),XQ(f)
      • Q(f);CHECK,OGATE,P_SPINQ(f),XB(H)::QAR1(E),XQ(f)
      • S(i);CHECK,N_GUARD::QAB(E),XS(i)
      • B(h);OGATE,XP(F)::R(C)+P(D),XB(h)
      • P(d);OGATEB::QAB(E)
      • R(a);N_GUARD::QAR(E)
      • B(h);OGATE::R(C)+P(D),XB(h)
      • S(i);N_GUARD::QAB(E)
      • S(i);N_GUARD,SBLOCK::B(G)
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