MESON Chess Problem Database

Problem Display
PID: 206327 (8/8/pn6/R7/nkP5/R5p1/P5P1/2K4Q w - - 0 1)

Peterson, Emil

Schackvarlden, 1925

8/8/pn6/R7/nkP5/R5p1/P5P1/2K4Q

#2

7 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc4
      • 2.Qh4#
    • 1...Kxa5
      • 2.Qe1#
  • Tries
    • 1.Rb3+?
      • 1...Kxc4
        • 2.Qh4#
      • 1...Kxa5!
    • 1.Qd1?
      • 1...Kxa3
        • 2.Qb3#
      • 1...Kxc4
        • 2.Qg4#
      • 1...Kxa5
        • 2.Qe1#
        • 2.Qd2#
      • 1...Sxc4
        • 2.Qxa4#
      • 1...Sb2
        • 2.Qb3#
      • 1...Sc3
        • 2.Qb3#
      • 1...Sd5
        • 2.Qxa4#
      • 1...Sd7
        • 2.Qxa4#
      • 1...Sa8
        • 2.Qxa4#
      • 1...Sc8
        • 2.Qxa4#
      • 1...Sc5!
    • 1.Qe1+?
      • 1...Kxc4
        • 2.Qe4#
      • 1...Sc3
        • 2.Qxc3#
      • 1...Kxa3!
  • Keys
    • 1.Qh8!
      • 1...Kxa3
        • 2.Qb2#
      • 1...Kxc4
        • 2.Qh4#
      • 1...Kxa5
        • 2.Qc3#
      • 1...Sxc4
        • 2.R3xa4#
      • 1...Sb2
        • 2.Qc3#
      • 1...Sc3
        • 2.Qxc3#
      • 1...Sc5
        • 2.Qc3#
      • 1...Sd5
        • 2.R3xa4#
      • 1...Sd7
        • 2.R3xa4#
      • 1...Sa8
        • 2.R3xa4#
      • 1...Sc8
        • 2.R3xa4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • K(c);OGATEB,P-FLIGHT,XP(F)::QAR(B)
    • K(c);P_SPINS(b),S_FLIGHT,XR(G)::QAB(B)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • K(c);P-FLIGHT,XP(F)::QAR(B)
      • Refutation
        • K(c);S_FLIGHT,XR(G)
    • Try
      • Q(B);
      • Vars
        • K(c);P_SPINS(b),S_FLIGHT,XR(E)::QAR1(B)
        • K(c);OGATEB,P-FLIGHT,XP(F)::QAR(B)
        • S(e);N_GUARD,SBLOCK,XP(F)::QAR1(B),XS(b)
        • S(b);::QAR1(B)
        • S(e);N_GUARD::QAR1(B),XS(b)
      • Refutation
        • S(b);
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);OGATEB,P-FLIGHT,XP(F)::QAR2(B)
        • S(b);N_GUARD,P_SPINS(b)::QAB1(B),XS(b)
      • Refutation
        • K(c);P_SPINS(b),S_FLIGHT,XR(E)
  • Actual
    • Q(B);
    • Vars
      • K(c);P_SPINS(b),S_FLIGHT,XR(E)::QAB1(B)
      • K(c);OGATEB,P-FLIGHT,XP(F)::QAR(B)
      • K(c);P_SPINS(b),S_FLIGHT,XR(G)::QAB(B)
      • S(e);N_GUARD,SBLOCK,XP(F)::R1(E),XS(b)
      • S(b);N_GUARD::QAB1(B)
      • S(b);N_GUARD::QAB1(B),XS(b)
      • S(e);N_GUARD::R1(E),XS(b)
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