MESON Chess Problem Database

Problem Display
PID: 207006 (2BK4/3N1p1n/3p1n2/3kb3/2R5/1q6/P1N1Q3/8 w - - 0 1)

Anonymous

Sissa, 1860

2BK4/3N1p1n/3p1n2/3kb3/2R5/1q6/P1N1Q3/8

#2

7 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa2
      • 2.Sb6#
    • 1...Qxc2
      • 2.Sb6#
    • 1...Qa4
      • 2.Sb6#
    • 1...Qa3
      • 2.Sb6#
    • 1...Qc3
      • 2.Sb6#
    • 1...Qd3
      • 2.Sb6#
    • 1...Qf3
      • 2.Sb6#
    • 1...Qg3
      • 2.Sb6#
    • 1...Qh3
      • 2.Sb6#
    • 1...Qb6+
      • 2.Sxb6#
  • Tries
    • 1.Se3+?
      • 1...Ke6
        • 2.Sc5#
        • 2.Sf8#
      • 1...Qxe3!
    • 1.Sb4+?
      • 1...Ke6
        • 2.Sc5#
        • 2.Sf8#
      • 1...Qxb4!
    • 1.Bb7+?
      • 1...Ke6
        • 2.Sd4#
      • 1...Qxb7!
    • 1.Rc5+?
      • 1...Ke6
        • 2.Sd4#
        • 2.Sf8#
      • 1...dxc5!
    • 1.Qd3+?
      • 1...Ke6
        • 2.Sc5#
        • 2.Sf8#
      • 1...Qxd3
        • 2.Sb6#
      • 1...Bd4!
    • 1.Qe4+?
      • 1...Ke6
        • 2.Sd4#
        • 2.Sc5#
        • 2.Sf8#
      • 1...Sxe4!
  • Keys
    • 1.Qf3+!
      • 1...Kxc4
        • 2.Qxb3#
      • 1...Ke6
        • 2.Sc5#
        • 2.Sxf6#
        • 2.Sf8#
      • 1...Qxf3
        • 2.Sb6#
      • 1...Se4
        • 2.Qxf7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 9
  • Sets
    • Q(a);N_GUARD,XP(A)::S(E)
    • Q(a);N_GUARD,XS(B)::S(E)
    • Q(a);N_GUARD::S(E)
    • Q(a);CHECK,N_GUARD::S(E),XQ(a)
  • Tries
    • Try
      • S(B);CHECK
      • Refutation
        • Q(a);XS(B)
    • Try
      • S(B);CHECK
      • Refutation
        • Q(a);XS(B)
    • Try
      • B(F);CHECK
      • Vars
        • K(b);P_SPINB(c),S_FLIGHT::S(B)
      • Refutation
        • Q(a);XB(F)
    • Try
      • R(D);CHECK
      • Refutation
        • P(d);XR(D)
    • Try
      • Q(C);CHECK
      • Vars
        • Q(a);XQ(C)::S(E)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • Q(C);CHECK
      • Refutation
        • S(e);XQ(C)
  • Actual
    • Q(C);CHECK
    • Vars
      • K(b);OGATEB,S_FLIGHT,XR(D)::QAB1(C),XQ(a)
      • Q(a);XQ(C)::S(E)
      • S(e);OGATE,P_SPINS(e)::QAB(C),XP(f)
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