MESON Chess Problem Database

Problem Display
PID: 159748 (8/8/8/8/8/nK2N3/PR6/k7 w - - 0 1)

Almay, Joszef

Magyar Sakkvilag, 1926

8/8/8/8/8/nK2N3/PR6/k7

#2

4 + 2

15148 Sadier Collection 2017
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Sc2#
    • 1...Sc2
      • 2.Sxc2#
    • 1...Sc4
      • 2.Sc2#
    • 1...Sb5
      • 2.Sc2#
  • Tries
    • 1.Rb1+?
      • 1...Sxb1
        • 2.Sc2#
      • 1...Kxb1!
    • 1.Re2?
      • 1...Kb1
        • 2.Re1#
      • 1...Sb1
        • 2.Sc2#
      • 1...Sc4
        • 2.Re1#
      • 1...Sb5
        • 2.Re1#
      • 1...Sc2!
    • 1.Rf2?
      • 1...Kb1
        • 2.Rf1#
      • 1...Sb1
        • 2.Sc2#
      • 1...Sc4
        • 2.Rf1#
      • 1...Sb5
        • 2.Rf1#
      • 1...Sc2!
    • 1.Rg2?
      • 1...Kb1
        • 2.Rg1#
      • 1...Sb1
        • 2.Sc2#
      • 1...Sc4
        • 2.Rg1#
      • 1...Sb5
        • 2.Rg1#
      • 1...Sc2!
    • 1.Rh2?
      • 1...Kb1
        • 2.Rh1#
      • 1...Sb1
        • 2.Sc2#
      • 1...Sc4
        • 2.Rh1#
      • 1...Sb5
        • 2.Rh1#
      • 1...Sc2!
  • Keys
    • 1.Rd2!
      • 1...Kb1
        • 2.Rd1#
      • 1...Sb1
        • 2.Sc2#
      • 1...Sc2
        • 2.Rd1#
      • 1...Sc4
        • 2.Rd1#
      • 1...Sb5
        • 2.Rd1#

This anticipates 218851(1987)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::S(D)
    • S(b);N_GUARD::S(D),XS(b)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • S(b);SBLOCK,XR(B)::S(D)
      • Refutation
        • K(a);P-FLIGHT,XR(B)
    • Try
      • R(B);
      • Vars
        • K(a);P-FLIGHT::R(B)
        • S(b);N_GUARD,SBLOCK::S(D)
        • S(b);N_GUARD::R(B)
      • Refutation
        • S(b);
    • Try
      • R(B);
      • Vars
        • K(a);P-FLIGHT::R(B)
        • S(b);N_GUARD,SBLOCK::S(D)
        • S(b);N_GUARD::R(B)
      • Refutation
        • S(b);
    • Try
      • R(B);
      • Vars
        • K(a);P-FLIGHT::R(B)
        • S(b);N_GUARD,SBLOCK::S(D)
        • S(b);N_GUARD::R(B)
      • Refutation
        • S(b);
    • Try
      • R(B);
      • Vars
        • K(a);P-FLIGHT::R(B)
        • S(b);N_GUARD,SBLOCK::S(D)
        • S(b);N_GUARD::R(B)
      • Refutation
        • S(b);
  • Actual
    • R(B);
    • Vars
      • K(a);P-FLIGHT::R(B)
      • S(b);N_GUARD,SBLOCK::S(D)
      • S(b);N_GUARD::R(B)
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