MESON Chess Problem Database

Problem Display
PID: 148062 (B7/5K2/8/4k3/1R5N/1nR5/1Qn5/8 w - - 0 1)

Souza Campoo, A

Rivista Scacchistica Italiana, 1909

B7/5K2/8/4k3/1R5N/1nR5/1Qn5/8

#2

6 + 3

5454 Near Snap 2013
14868 Pirnie Collection 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Sca1
      • 2.Qh2#
    • 1...Se1
      • 2.Qh2#
    • 1...Sa3
      • 2.Qh2#
    • 1...Se3
      • 2.Qh2#
    • 1...Scd4
      • 2.Qh2#
  • Tries
    • 1.Sf3+?
      • 1...Kf5
        • 2.Qxc2#
      • 1...Kd6!
    • 1.Rxc2+?
      • 1...Sd4
        • 2.Qxd4#
      • 1...Kd6!
    • 1.Rcxb3+?
      • 1...Sd4
        • 2.Qxd4#
        • 2.Qh2#
      • 1...Kd6!
    • 1.Rd3+?
      • 1...Scd4
        • 2.Qh2#
      • 1...Sbd4!
    • 1.Rbc4?
      • 1...Scd4
        • 2.Qh2#
      • 1...Sbd4
        • 2.Qb8#
      • 1...Sca1
        • 2.Qh2#
      • 1...Se1
        • 2.Qh2#
      • 1...Sa3
        • 2.Qh2#
      • 1...Se3
        • 2.Qh2#
      • 1...Sb4
        • 2.Qh2#
      • 1...Sba1
        • 2.Qb8#
      • 1...Sc1
        • 2.Qb8#
      • 1...Sd2
        • 2.Qb8#
      • 1...Sa5
        • 2.Qb8#
      • 1...Sc5
        • 2.Qb8#
      • 1...Kd6!
    • 1.Rg4?
      • 1...Sbd4
        • 2.Qb8#
      • 1...Sca1
        • 2.Qh2#
      • 1...Se1
        • 2.Qh2#
      • 1...Sa3
        • 2.Qh2#
      • 1...Se3
        • 2.Qh2#
      • 1...Sb4
        • 2.Qh2#
      • 1...Scd4
        • 2.Qh2#
      • 1...Sba1
        • 2.Qb8#
      • 1...Sc1
        • 2.Qb8#
      • 1...Sd2
        • 2.Qb8#
      • 1...Sa5
        • 2.Qb8#
      • 1...Sc5
        • 2.Qb8#
      • 1...Kd6!
  • Keys
    • 1.Rd4!
      • 1...Kxd4
        • 2.Sf3#
      • 1...Scxd4
        • 2.Qh2#
      • 1...Sbxd4
        • 2.Qb8#
      • 1...Sca1
        • 2.Re3#
      • 1...Se1
        • 2.Re3#
      • 1...Sa3
        • 2.Re3#
      • 1...Se3
        • 2.Rxe3#
      • 1...Sb4
        • 2.Re3#
      • 1...Sba1
        • 2.Rc5#
      • 1...Sc1
        • 2.Rc5#
      • 1...Sd2
        • 2.Rc5#
      • 1...Sa5
        • 2.Rc5#
      • 1...Sc5
        • 2.Rxc5#

Anticipated by 148059(1892), 148061(1906)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • S(a);OGATE::QAB(A)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB(A),XS(a)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(B);CHECK,XS(a)
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAB1(A),XS(b)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(B);CHECK,XS(b)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(B);CHECK
      • Vars
        • S(a);OGATE,P_SPINS(a)::QAB(A)
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • R(C);
      • Vars
        • S(a);OGATE::QAB(A)
        • S(b);OGATE::QAB(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(C);
      • Vars
        • S(b);OGATE::QAB(A)
        • S(a);OGATE::QAB(A)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • R(C);
    • Vars
      • K(c);S_FLIGHT,XR(C)::S(D)
      • S(a);OGATE,SBLOCK,XR(C)::QAB(A)
      • S(b);OGATE,SBLOCK,XR(C)::QAB(A)
      • S(a);N_GUARD::R(B)
      • S(a);N_GUARD::R(B),XS(a)
      • S(b);N_GUARD::R(B)
      • S(b);N_GUARD::R(B),XS(b)
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