MESON Chess Problem Database

Problem Display
PID: 10512 (Q7/PnKN1p2/5p2/5P2/2k5/1R2P3/B7/8 w - - 0 1)

Mansfield, Comins

L'Italia Scacchistica, 1965

Q7/PnKN1p2/5p2/5P2/2k5/1R2P3/B7/8

#2

8 + 4

4054 Complete Mansfield/III 1999

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Rb4#
    • 1...Sa5
      • 2.Qe4#
    • 1...Sc5
      • 2.Sb6#
    • 1...Sd6
      • 2.Qc6#
    • 1...Sd8
      • 2.Qe4#
  • Tries
    • 1.Kb8?
      • 1...Sa5
        • 2.Qe4#
      • 1...Sc5
        • 2.Sb6#
      • 1...Sd6
        • 2.Qc6#
      • 1...Sd8
        • 2.Qe4#
      • 1...Kd5!
    • 1.Sxf6?
      • 1...Sa5
        • 2.Qd5#
      • 1...Sc5
        • 2.Qd5#
      • 1...Sd6
        • 2.Qd5#
        • 2.Qc6#
      • 1...Sd8
        • 2.Qd5#
      • 1...Kc5!
    • 1.Ra3+?
      • 1...Kb5
        • 2.Qxb7#
      • 1...Kb4!
    • 1.Qe8?
      • threat
        • 2.Qxf7#
        • 2.Qe4#
      • 1...Kd5
        • 2.Rb1#
        • 2.Rb2#
        • 2.Ra3#
        • 2.Rc3#
        • 2.Rd3#
        • 2.Rb4#
        • 2.Rb5#
        • 2.Rb6#
        • 2.Rxb7#
      • 1...Sc5
        • 2.Sb6#
      • 1...Sd8
        • 2.Qe4#
      • 1...Sd6!
    • 1.Qf8?
      • threat
        • 2.Sb6#
        • 2.Qxf7#
      • 1...Kd5
        • 2.Rb4#
      • 1...Sc5
        • 2.Sb6#
        • 2.Qxc5#
      • 1...Sd8
        • 2.Sb6#
        • 2.Qc5#
      • 1...Sd6!
    • 1.e4?
      • 1...Sd6
        • 2.Qd5#
      • 1...Sa5
        • 2.Qd5#
      • 1...Sc5
        • 2.Qd5#
      • 1...Sd8
        • 2.Qd5#
      • 1...Kd4!
  • Keys
    • 1.Qb8!
      • 1...Kd5
        • 2.Rb4#
      • 1...Sa5
        • 2.Qb5#
      • 1...Sc5
        • 2.Sb6#
      • 1...Sd6
        • 2.Ra3#
      • 1...Sd8
        • 2.Ra3#
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • K(a);P_SPINS(c),S_FLIGHT::B(A)+R(B)
    • S(c);OGATE::QAR2(H)
    • S(c);SBLOCK::S(G)
  • Tries
    • Try
      • K(F);S_FLIGHT
      • Vars
        • S(c);OGATE::QAR2(H)
        • S(c);SBLOCK::S(G)
      • Refutation
        • K(a);P_SPINS(c),S_FLIGHT
    • Try
      • S(G);XP(b)
      • Vars
        • S(c);OGATE::QAB1(H)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR2(H),XS(c)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(H);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);SBLOCK::S(G)
        • S(c);::QAR2(H)
      • Refutation
        • S(c);
    • Try
      • Q(H);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);S_FLIGHT::B(A)+R(B)
      • Refutation
        • S(c);
    • Try
      • P(C);
      • Vars
        • S(c);OGATE::QAB1(H)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(H);
    • Vars
      • K(a);S_FLIGHT::B(A)+R(B)
      • S(c);OGATE::QAB1(H)
      • S(c);SBLOCK::S(G)
      • S(c);::B(A)+R(B)
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