MESON Chess Problem Database

Problem Display
PID: 201355 (n7/2p2p2/1pBBkp1p/1K5P/5Q2/8/8/8 w - - 0 1)

Letzen, Einar

Tidskrift for Schack, 1922

n7/2p2p2/1pBBkp1p/1K5P/5Q2/8/8/8

#2

5 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...f5
      • 2.Qe5#
    • 1...cxd6
      • 2.Qe4#
  • Tries
    • 1.Ka4?
      • 1...cxd6
        • 2.Qe4#
      • 1...f5
        • 2.Qe5#
      • 1...b5+!
    • 1.Kb4?
      • 1...cxd6
        • 2.Qe4#
      • 1...f5
        • 2.Qe5#
      • 1...b5!
    • 1.Kc4?
      • 1...cxd6
        • 2.Qe4#
      • 1...f5
        • 2.Qe5#
      • 1...b5+!
    • 1.Ka6?
      • 1...cxd6
        • 2.Qe4#
      • 1...f5
        • 2.Qe5#
      • 1...b5!
    • 1.Bxc7?
      • threat
        • 2.Qe4#
      • 1...Ke7
        • 2.Qd6#
      • 1...f5
        • 2.Qe5#
        • 2.Qd6#
      • 1...Sxc7+!
    • 1.Be7?
      • threat
        • 2.Qe4#
        • 2.Qxf6#
      • 1...f5
        • 2.Qe3#
      • 1...Kxe7!
    • 1.Qe3+?
      • 1...Kf5
        • 2.Bd7#
      • 1...Kxd6!
    • 1.Qf3?
      • threat
        • 2.Qd5#
      • 1...Kxd6
        • 2.Qxf6#
      • 1...cxd6
        • 2.Qe4#
      • 1...f5!
    • 1.Qd4?
      • threat
        • 2.Qd5#
      • 1...cxd6
        • 2.Qe4#
      • 1...f5
        • 2.Qe5#
      • 1...Kf5!
    • 1.Qf5+?
      • 1...Kxd6
        • 2.Qxf6#
      • 1...Kxf5!
  • Keys
    • 1.Qh4!
      • 1...Kf5
        • 2.Bd7#
      • 1...Kxd6
        • 2.Qxf6#
      • 1...cxd6
        • 2.Qe4#
      • 1...f5
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(c);N_GUARD::QAR1(A)
    • P(e);SBLOCK,XB(E)::QAR2(A)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • P(e);SBLOCK,XB(E)::QAR2(A)
        • P(c);N_GUARD::QAR1(A)
      • Refutation
        • P(a);CHECK
    • Try
      • K(B);P-FLIGHT
      • Vars
        • P(e);SBLOCK,XB(E)::QAR2(A)
        • P(c);N_GUARD::QAR1(A)
      • Refutation
        • P(a);
    • Try
      • K(B);S_FLIGHT
      • Vars
        • P(e);SBLOCK,XB(E)::QAR2(A)
        • P(c);N_GUARD::QAR1(A)
      • Refutation
        • P(a);CHECK
    • Try
      • K(B);S_FLIGHT
      • Vars
        • P(e);SBLOCK,XB(E)::QAR2(A)
        • P(c);N_GUARD::QAR1(A)
      • Refutation
        • P(a);
    • Try
      • B(E);XP(e)
      • Threat
        • QAR2(A)
      • Vars
        • K(b);P-FLIGHT::QAB1(A)
      • Refutation
        • S(g);CHECK,XB(E)
    • Try
      • B(E);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);SBLOCK::QAR(A)
      • Refutation
        • K(b);P-FLIGHT,XB(E)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::B(D)
      • Refutation
        • K(b);P-FLIGHT,XB(E)
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • K(b);P-FLIGHT,XB(E)::QAR2(A),XP(c)
        • P(e);SBLOCK,XB(E)::QAR2(A)
      • Refutation
        • P(c);
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(e);SBLOCK,XB(E)::QAR2(A)
        • P(c);N_GUARD::QAR1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT,XB(E)::QAR2(A),XP(c)
      • Refutation
        • K(b);S_FLIGHT,XQ(A)
  • Actual
    • Q(A);
    • Vars
      • K(b);S_FLIGHT::B(D)
      • K(b);P-FLIGHT,XB(E)::QAR2(A),XP(c)
      • P(e);SBLOCK,XB(E)::QAR2(A)
      • P(c);OGATE,SBLOCK::QAR1(A)
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