MESON Chess Problem Database

Problem Display
PID: 226843 (bB1K4/6p1/4Qpp1/3p4/4R1P1/5k2/2n5/3N1B1n w - - 0 1)

Larsson, Lennart

Tidskrift for Schack, 1978

bB1K4/6p1/4Qpp1/3p4/4R1P1/5k2/2n5/3N1B1n

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sg3
      • 2.Rf4#
    • 1...Sa1
      • 2.Re3#
    • 1...Se1
      • 2.Re3#
    • 1...Sa3
      • 2.Re3#
    • 1...Se3
      • 2.Rxe3#
    • 1...Sb4
      • 2.Re3#
    • 1...Sd4
      • 2.Re3#
    • 1...g5
      • 2.Qf5#
  • Tries
    • 1.Re1?
      • threat
        • 2.Qe2#
      • 1...Se3
        • 2.Rxe3#
      • 1...Sd4
        • 2.Re3#
      • 1...Sg3!
    • 1.Re2?
      • threat
        • 2.Bg2#
      • 1...Sf2
        • 2.Rxf2#
      • 1...Se1
        • 2.Re3#
      • 1...Se3
        • 2.Rxe3#
      • 1...f5!
    • 1.Ra4?
      • threat
        • 2.Qe2#
      • 1...Sg3
        • 2.Rf4#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sd4!
    • 1.Rb4?
      • threat
        • 2.Qe2#
      • 1...Sg3
        • 2.Rf4#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sd4!
    • 1.Rd4?
      • threat
        • 2.Qe2#
      • 1...Sg3
        • 2.Rf4#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sxd4!
    • 1.Qe5?
      • threat
        • 2.Qf4#
      • 1...g5
        • 2.Qf5#
      • 1...fxe5!
    • 1.Qa6?
      • threat
        • 2.Qe2#
      • 1...Kxe4
        • 2.Qd3#
      • 1...Sg3
        • 2.Rf4#
      • 1...Sd4
        • 2.Qd3#
      • 1...Se3!
    • 1.Qd6?
      • threat
        • 2.Qf4#
      • 1...Kxe4
        • 2.Qf4#
      • 1...g5!
    • 1.Qxf6+?
      • 1...Kxe4
        • 2.Qf4#
      • 1...gxf6!
  • Keys
    • 1.Rc4!
      • threat
        • 2.Qe2#
      • 1...Sg3
        • 2.Rf4#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sd4
        • 2.Rc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 5
  • Sets
    • S(a);SBLOCK::R1(C)
    • S(b);N_GUARD::R1(C)
    • S(b);N_GUARD::R1(C),XS(b)
    • P(f);N_GUARD::QAR2(E)
  • Tries
    • Try
      • R(C);
      • Threat
        • QAB1(E)
      • Vars
        • S(b);N_GUARD::R1(C),XS(b)
        • S(b);N_GUARD::R1(C)
      • Refutation
        • S(a);
    • Try
      • R(C);
      • Threat
        • B(B)
      • Vars
        • S(a);N_GUARD::R1(C),XS(a)
        • S(b);N_GUARD::R1(C)
        • S(b);N_GUARD::R1(C),XS(b)
      • Refutation
        • P(e);
    • Try
      • R(C);
      • Threat
        • QAB1(E)
      • Vars
        • S(a);SBLOCK::R1(C)
        • S(b);N_GUARD::QAR1(E),XS(b)
      • Refutation
        • S(b);
    • Try
      • R(C);
      • Threat
        • QAB1(E)
      • Vars
        • S(a);SBLOCK::R1(C)
        • S(b);N_GUARD::QAR1(E),XS(b)
      • Refutation
        • S(b);
    • Try
      • R(C);
      • Threat
        • QAB1(E)
      • Vars
        • S(a);SBLOCK::R1(C)
        • S(b);N_GUARD::QAR1(E),XS(b)
      • Refutation
        • S(b);XR(C)
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • P(f);N_GUARD::QAR2(E)
      • Refutation
        • P(e);XQ(E)
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • K(c);S_FLIGHT,XR(C)::QAB1(E)
        • S(a);SBLOCK::R1(C)
        • S(b);N_GUARD::QAR2(E)
      • Refutation
        • S(b);
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • K(c);S_FLIGHT,XR(C)::QAR1(E)
      • Refutation
        • P(f);
    • Try
      • Q(E);CHECK,XP(e)
      • Vars
        • K(c);S_FLIGHT,XR(C)::QAR1(E)
      • Refutation
        • P(g);XQ(E)
  • Actual
    • R(C);
    • Threat
      • QAB1(E)
    • Vars
      • S(a);SBLOCK::R1(C)
      • S(b);N_GUARD::QAR1(E),XS(b)
      • S(b);N_GUARD::R(C)
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