MESON Chess Problem Database

Problem Display
PID: 91386 (b7/3pN3/1P1k1P2/p1p2Kp1/3rp3/8/8/B2Q3B w - - 0 1)

den Toom, Cornelis

Probleemblad, 1975

b7/3pN3/1P1k1P2/p1p2Kp1/3rp3/8/8/B2Q3B

#2

7 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd1
      • 2.Be5#
    • 1...Rd2
      • 2.Be5#
    • 1...Rd3
      • 2.Be5#
    • 1...Rd5+
      • 2.Be5#
    • 1...e3
      • 2.Sc8#
  • Tries
    • 1.Qb3?
      • threat
        • 2.Qg3#
      • 1...c4
        • 2.Qa3#
      • 1...Rd3
        • 2.Be5#
      • 1...e3
        • 2.Sc8#
      • 1...Rd5+!
    • 1.Qd2?
      • threat
        • 2.Qh2#
      • 1...Rd5+
        • 2.Be5#
      • 1...Rxd2
        • 2.Be5#
      • 1...Rd3
        • 2.Be5#
      • 1...e3
        • 2.Sc8#
      • 1...g4
        • 2.Qf4#
      • 1...c4!
    • 1.Qxd4+?
      • 1...Bd5
        • 2.Qe5#
        • 2.Qxd5#
      • 1...cxd4!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Qg3#
      • 1...Rd5+
        • 2.Be5#
      • 1...Rxd3
        • 2.Be5#
      • 1...exd3
        • 2.Sc8#
      • 1...c4
        • 2.Qa3#
      • 1...e3
        • 2.Sc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(a);N_SPINR(a),OGATE,XQ(B)::B(A)
    • R(a);OGATE::B(A)
    • R(a);CHECK,OGATE::B(A)
    • P(b);::S(G)
  • Tries
    • Try
      • Q(B);N_PINR(a)
      • Threat
        • QAB(B)
      • Vars
        • P(d);OGATEB::QAB(B)
        • R(a);OGATE::B(A)
        • P(b);::S(G)
      • Refutation
        • R(a);CHECK
    • Try
      • Q(B);
      • Threat
        • QAB(B)
      • Vars
        • R(a);CHECK,OGATE::B(A)
        • R(a);N_SPINR(a),OGATE,XQ(B)::B(A)
        • R(a);OGATE::B(A)
        • P(b);::S(G)
        • P(e);N_GUARD::QAB(B)
      • Refutation
        • P(d);
    • Try
      • Q(B);CHECK,XR(a)
      • Refutation
        • P(d);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB(B)
    • Vars
      • R(a);CHECK,OGATE::B(A)
      • R(a);N_SPINR(a),OGATE,XQ(B)::B(A)
      • P(b);N_SPINR(a),XQ(B)::S(G)
      • P(d);OGATEB::QAB(B)
      • P(b);::S(G)
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