MESON Chess Problem Database

Problem Display
PID: 107881 (4nq1r/4b1Nn/6Q1/3pNpp1/3Pp3/4k3/3RPRp1/4BbK1 w - - 0 1)

Casa, Alex

Phenix, 2004

4nq1r/4b1Nn/6Q1/3pNpp1/3Pp3/4k3/3RPRp1/4BbK1

#2

9 + 12

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qg8
      • 2.Sxf5#
    • 1...Bf6
      • 2.Sxf5#
    • 1...Shf6
      • 2.Sxf5#
    • 1...Sef6
      • 2.Sxf5#
    • 1...f4
      • 2.Sg4#
  • Tries
    • 1.Qh5?
      • threat
        • 2.Qh3#
      • 1...Bxe2
        • 2.Qxe2#
      • 1...Shf6
        • 2.Sxf5#
      • 1...f4
        • 2.Sg4#
      • 1...g4!
    • 1.Qb6?
      • threat
        • 2.Qb3#
      • 1...Bxe2
        • 2.Rdxe2#
      • 1...Bb4!
    • 1.Qh6?
      • threat
        • 2.Qh3#
      • 1...Shf6
        • 2.Sxf5#
      • 1...f4
        • 2.Sg4#
      • 1...Bxe2!
  • Keys
    • 1.Qxf5!
      • threat
        • 2.Sg4#
      • 1...Qxf5
        • 2.Sxf5#
      • 1...Bxe2
        • 2.Rfxe2#
      • 1...Shf6
        • 2.Qxg5#
      • 1...Sef6
        • 2.Qh3#
      • 1...g4
        • 2.Sxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(k);N_GUARD::S(I),XP(f)
    • B(h);S_CUTQ(k)::S(I),XP(f)
    • S(i);S_CUTQ(k)::S(I),XP(f)
    • S(j);S_CUTQ(k)::S(I),XP(f)
    • P(f);N_GUARD::S(G)
  • Tries
    • Try
      • Q(H);
      • Threat
        • QAR(H)
      • Vars
        • B(a);OGATE,XP(D)::QAR1(H),XB(a)
        • S(i);S_CUTQ(k)::S(I),XP(f)
        • P(f);N_GUARD::S(G)
      • Refutation
        • P(g);
    • Try
      • Q(H);
      • Threat
        • QAR(H)
      • Vars
        • B(a);OGATE,XP(D)::R1(C),XB(a)
      • Refutation
        • B(h);
    • Try
      • Q(H);P_PINP(g)
      • Threat
        • QAR(H)
      • Vars
        • S(i);S_CUTQ(k)::S(I),XP(f)
        • P(f);N_GUARD,N_SPINP(g)::S(G)
      • Refutation
        • B(a);XP(D)
  • Actual
    • Q(H);XP(f)
    • Threat
      • S(G)
    • Vars
      • Q(k);XQ(H)::S(I),XQ(k)
      • B(a);OGATE,XP(D)::R1(E),XB(a)
      • S(i);N_GUARD,S_CUTB(h),S_CUTQ(k)::QAB(H),XP(g)
      • S(j);S_CUTQ(k)::QAR(H)
      • P(g);::S(G),XP(g)
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