MESON Chess Problem Database

Problem Display
PID: 249541 (8/1Q6/8/8/p1n2p2/8/2R5/k3K3 w - - 0 1)

Junker, Karl

Deutsche Schachzeitung, 1983

8/1Q6/8/8/p1n2p2/8/2R5/k3K3

#2

3 + 4

3713 Snap 2021
6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sb2
      • 2.Qxb2#
    • 1...Sd2
      • 2.Qb2#
    • 1...Sa3
      • 2.Qb2#
    • 1...Se3
      • 2.Qb2#
    • 1...Sa5
      • 2.Qb2#
    • 1...Se5
      • 2.Qb2#
    • 1...Sd6
      • 2.Qb2#
  • Tries
    • 1.Ke2?
      • threat
        • 2.Qh1#
      • 1...Sb2
        • 2.Qxb2#
      • 1...Sd2
        • 2.Qb2#
      • 1...Sa3
        • 2.Qb2#
      • 1...Se3
        • 2.Qb2#
      • 1...f3+!
    • 1.Kf2?
      • threat
        • 2.Qh1#
      • 1...Sb2
        • 2.Qxb2#
      • 1...Sd2
        • 2.Qb2#
      • 1...Sa3
        • 2.Qb2#
      • 1...Se3
        • 2.Qb2#
      • 1...f3!
    • 1.Rxc4?
      • threat
        • 2.Rxa4#
      • 1...Ka2
        • 2.Rxa4#
      • 1...a3!
    • 1.Qb3?
      • threat
        • 2.Rc1#
        • 2.Ra2#
        • 2.Qa2#
      • 1...Sb2
        • 2.Rc1#
        • 2.Qxb2#
      • 1...Sd2
        • 2.Ra2#
        • 2.Qa2#
        • 2.Qb2#
      • 1...Sa3
        • 2.Ra2#
        • 2.Qa2#
        • 2.Qb2#
      • 1...axb3!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qd1#
      • 1...Kb1
        • 2.Qd1#
      • 1...Sb2
        • 2.Rc1#
      • 1...Sd2
        • 2.Qa2#
      • 1...Sa3
        • 2.Qa2#
      • 1...Se3
        • 2.Qa2#

Anticipated by 102298(1928)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • S(c);N_GUARD::QAB1(C),XS(c)
    • S(c);N_GUARD::QAB1(C)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Threat
        • QAB1(C)
      • Vars
        • S(c);N_GUARD::QAB1(C),XS(c)
        • S(c);N_GUARD::QAB1(C)
      • Refutation
        • P(d);CHECK
    • Try
      • K(A);S_FLIGHT
      • Threat
        • QAB1(C)
      • Vars
        • S(c);N_GUARD::QAB1(C),XS(c)
        • S(c);N_GUARD::QAB1(C)
      • Refutation
        • P(d);
    • Try
      • R(B);XS(c)
      • Threat
        • R(B),XP(b)
      • Vars
        • K(a);P-FLIGHT::R(B),XP(b)
      • Refutation
        • P(b);
    • Try
      • Q(C);
      • Threat
        • DUALS(3)
      • Refutation
        • P(b);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAR(C)
    • Vars
      • K(a);P-FLIGHT::QAR2(C)
      • S(c);SBLOCK::R(B)
      • S(c);OGATE::QAR1(C)
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