MESON Chess Problem Database

Problem Display
PID: 81328 (8/8/8/5N2/1Q6/pn1k4/R7/1K6 w - - 0 1)

Asplund, Per Ivan Rune

Tidskrift for Schack, 1970

8/8/8/5N2/1Q6/pn1k4/R7/1K6

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Rd2#
      • 2.Qd4#
    • 1...Sc1
      • 2.Rd2#
      • 2.Qd4#
    • 1...Sd2+
      • 2.Rxd2#
    • 1...Sd4
      • 2.Qxd4#
    • 1...Sa5
      • 2.Rd2#
      • 2.Qd4#
    • 1...Sc5
      • 2.Rd2#
      • 2.Qd4#
  • Tries
    • 1.Rc2?
      • threat
        • 2.Qc4#
      • 1...Sd2+
        • 2.Rxd2#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sa5
        • 2.Rd2#
        • 2.Qd4#
      • 1...a2+!
    • 1.Rf2?
      • 1...Sd2+
        • 2.Rxd2#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sa1
        • 2.Rd2#
        • 2.Qd4#
      • 1...Sc1
        • 2.Rd2#
        • 2.Qd4#
      • 1...Sa5
        • 2.Rd2#
        • 2.Qd4#
      • 1...Sc5
        • 2.Rd2#
        • 2.Qd4#
      • 1...a2+!
    • 1.Rg2?
      • 1...Sd2+
        • 2.Rxd2#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sa1
        • 2.Rd2#
        • 2.Qd4#
      • 1...Sc1
        • 2.Rd2#
        • 2.Qd4#
      • 1...Sa5
        • 2.Rd2#
        • 2.Qd4#
      • 1...Sc5
        • 2.Rd2#
        • 2.Qd4#
      • 1...a2+!
    • 1.Rh2?
      • 1...Sd2+
        • 2.Rxd2#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sa1
        • 2.Rd2#
        • 2.Qd4#
      • 1...Sc1
        • 2.Rd2#
        • 2.Qd4#
      • 1...Sa5
        • 2.Rd2#
        • 2.Qd4#
      • 1...Sc5
        • 2.Rd2#
        • 2.Qd4#
      • 1...a2+!
    • 1.Qe4+?
      • 1...Kc3
        • 2.Rc2#
      • 1...Kxe4!
    • 1.Qb5+?
      • 1...Kc3
        • 2.Rc2#
      • 1...Ke4!
  • Keys
    • 1.Sd6!
      • 1...Sd2+
        • 2.Qxd2#
      • 1...Ke3
        • 2.Qe4#
      • 1...Sa1
        • 2.Qd2#
      • 1...Sc1
        • 2.Qd2#
      • 1...Sd4
        • 2.Qd2#
      • 1...Sa5
        • 2.Qd2#
      • 1...Sc5
        • 2.Qd2#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(b);CHECK,N_GUARD::R1(B),XS(b)
    • S(b);N_GUARD::QAR1(C),XS(b)
  • Tries
    • Try
      • R(B);
      • Threat
        • QAB1(C)
      • Vars
        • S(b);CHECK,N_GUARD::R1(B),XS(b)
        • S(b);N_GUARD::QAR1(C),XS(b)
      • Refutation
        • P(a);CHECK
    • Try
      • R(B);
      • Vars
        • S(b);CHECK,N_GUARD::R1(B),XS(b)
        • S(b);N_GUARD::QAR1(C),XS(b)
      • Refutation
        • P(a);CHECK
    • Try
      • R(B);
      • Vars
        • S(b);CHECK,N_GUARD::R1(B),XS(b)
        • S(b);N_GUARD::QAR1(C),XS(b)
      • Refutation
        • P(a);CHECK
    • Try
      • R(B);
      • Vars
        • S(b);CHECK,N_GUARD::R1(B),XS(b)
        • S(b);N_GUARD::QAR1(C),XS(b)
      • Refutation
        • P(a);CHECK
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);P-FLIGHT::R1(B)
      • Refutation
        • K(c);S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);P-FLIGHT::R1(B)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • S(D);
    • Vars
      • S(b);CHECK,N_GUARD::QAR1(C),XS(b)
      • K(c);P-FLIGHT::QAR1(C)
      • S(b);N_GUARD::QAR1(C)
      • S(b);N_GUARD,SBLOCK::QAR1(C)
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