MESON Chess Problem Database

Problem Display
PID: 6541 (8/2N5/3B4/8/2pk4/8/1R1NK3/8 w - - 0 1)

Schiffert, Gyorgy

Magyar Sakkvilag, 1931

8/2N5/3B4/8/2pk4/8/1R1NK3/8

#2

5 + 2

5454 Near Snap 2008
3713 Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Be5#
    • 1...c3
      • 2.Rb4#
  • Tries
    • 1.Sb1?
      • 1...c3
        • 2.Rb4#
      • 1...Ke4!
    • 1.Sf1?
      • 1...Kc3
        • 2.Be5#
      • 1...c3
        • 2.Rb4#
      • 1...Ke4!
    • 1.Sf3+?
      • 1...Kc3
        • 2.Be5#
      • 1...Ke4!
    • 1.Se4?
      • 1...c3
        • 2.Rb4#
      • 1...Kxe4!
    • 1.Se6+?
      • 1...Kc3
        • 2.Be5#
      • 1...Kd5!
    • 1.Rb1?
      • 1...c3
        • 2.Rb4#
      • 1...Kc3!
    • 1.Rb3?
      • 1...c3
        • 2.Rb4#
      • 1...cxb3!
    • 1.Rb6?
      • 1...c3
        • 2.Rb4#
      • 1...Kc3!
    • 1.Rb7?
      • 1...c3
        • 2.Rb4#
      • 1...Kc3!
    • 1.Rb8?
      • 1...c3
        • 2.Rb4#
      • 1...Kc3!
  • Keys
    • 1.Ra2!
      • 1...Kc3
        • 2.Sb5#
      • 1...c3
        • 2.Ra4#

This anticipates 23548(1969), 212384(1986)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::B(D)
    • P(a);OGATEB,SBLOCK::R(A)
  • Tries
    • Try
      • S(B);
      • Vars
        • P(a);OGATEB::R(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(B);
      • Vars
        • K(b);S_FLIGHT::B(D)
        • P(a);OGATEB,SBLOCK::R(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(B);CHECK
      • Vars
        • K(b);S_FLIGHT::B(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(B);
      • Vars
        • P(a);OGATEB::R(A)
      • Refutation
        • K(b);P-FLIGHT,XS(B)
    • Try
      • S(E);CHECK
      • Vars
        • K(b);S_FLIGHT::B(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • R(A);
      • Vars
        • P(a);OGATEB,SBLOCK::R(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(A);
      • Vars
        • P(a);OGATEB,SBLOCK::R(A)
      • Refutation
        • P(a);XR(A)
    • Try
      • R(A);
      • Vars
        • P(a);OGATEB,SBLOCK::R(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(A);
      • Vars
        • P(a);OGATEB,SBLOCK::R(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(A);
      • Vars
        • P(a);OGATEB,SBLOCK::R(A)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • R(A);
    • Vars
      • K(b);S_FLIGHT::S(E)
      • P(a);OGATEB,SBLOCK::R(A)
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