MESON Chess Problem Database

Problem Display
PID: 206452 (8/2RP1n2/1b6/3k1P2/2p1N1N1/5Q2/n1Pp2K1/1B4B1 w - - 0 1)

Somma, Francesco

L'Alfiere di Re, 1925

8/2RP1n2/1b6/3k1P2/2p1N1N1/5Q2/n1Pp2K1/1B4B1

#2

10 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ba5
      • 2.Rc5#
    • 1...Bc5
      • 2.Rxc5#
    • 1...Se5
      • 2.Sgf6#
    • 1...Sg5
      • 2.d8Q#
      • 2.d8R#
    • 1...Sd6
      • 2.Sc3#
      • 2.Sef6#
    • 1...Sh6
      • 2.d8Q#
      • 2.d8R#
    • 1...Sh8
      • 2.d8Q#
      • 2.d8R#
    • 1...c3
      • 2.Bxa2#
  • Tries
    • 1.Sef2+?
      • 1...Kd4
        • 2.Sd1#
        • 2.Sh1#
        • 2.Sh3#
      • 1...Kd6!
    • 1.Qd3+?
      • 1...Bd4
        • 2.Rc5#
        • 2.Qxd4#
      • 1...cxd3!
    • 1.d8Q+?
      • 1...Sd6
        • 2.Sxd2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sxd6#
        • 2.Sef6#
        • 2.Qxd6#
      • 1...Sxd8!
    • 1.d8R+?
      • 1...Sd6
        • 2.Sxd2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sxd6#
        • 2.Sef6#
        • 2.Rxd6#
      • 1...Sxd8!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Qxc4#
      • 1...Kxe4
        • 2.Qf3#
      • 1...Bxc7
        • 2.Qb7#
      • 1...cxb3
        • 2.c4#
      • 1...Bd4
        • 2.Qb7#
      • 1...Bc5
        • 2.Qb7#
      • 1...Se5
        • 2.Sgf6#
      • 1...Sd6
        • 2.Sef6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • B(e);N_GUARD::R1(I)
    • B(e);N_GUARD::R1(I),XB(e)
    • S(f);SBLOCK::S(G)
    • S(f);N_GUARD::P=Q
    • P(c);OGATEB::B(A),XS(a)
  • Tries
    • Try
      • S(F);CHECK
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Refutation
        • P(c);XQ(E)
    • Try
      • P(J);CHECK
      • Refutation
        • S(f);XQ(J)
    • Try
      • P(J);CHECK
      • Refutation
        • S(f);XR(J)
  • Actual
    • Q(E);P_PINP(c)
    • Threat
      • QAB1(E),XP(c)
    • Vars
      • K(d);N_SPINP(c),OGATEB,S_FLIGHT,XS(F)::QAB1(E)
      • B(e);OGATE,XR(I)::QAB(E)
      • P(c);N_SPINP(c),OGATE,XQ(E)::P(C)
      • B(e);OGATE::QAB(E)
      • S(f);SBLOCK::S(G)
      • S(f);SBLOCK::S(F)
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